history of thermometer

The History of Thermometers. The history of temperature stretches back for thousands of years. For almost a hundred years thermometers were basically unchanged. Inventions Famous Inventions Famous Inventors Patents & Trademarks Invention Timelines Computers & The Internet American History African American History African History Ancient History and Culture Asian History European History … The early version of this thermometer contained alcohol and in 1714 Fahrenheit developed a mercury thermometer using the same scale. Daniel Gabriel Fahrenheit (1686–1736), a Polish-born Dutch physicist, engineer, and glass blower, made contributions to thermometers as well. English physician, Sir Thomas Allbutt (1836–1925) invented the first practical medical thermometer used for taking the temperature of a person in 1867. However, they can measure a much greater temperature range than thermistors. PROMPTLY CONSULT YOUR PHYSICIAN OR CALL 911 IF YOU BELIEVE YOU HAVE A MEDICAL EMERGENCY. As early as 220 BC, Philo of Byzantium noted the expansion and contraction of air with hot and cold. Thermometers are used to tell the temperature of environments or substances. Thermocouples are among the most widely used industrial thermometers. So does air. The first real medical thermometer was invented by Sir Thomas Allbut in 1867. Mercury was found to expand much more dramatically with heat than alcohol. Thermoscopes were the earliest types of thermometers and they only showed changes in temperature but didn’t show numerical values. Two types are typically available. Unlike other types of thermometers, these provide temperature results in real time that can be downloaded to a computer to note the temperature history of an environment to check for variances. sensor is the thermometer which measures the temperature of the water. The thermoscope — essentially a thermometer without a scale — was the precursor to the m… 1992 March 2, Richard Preston, The New Yorker, "The Mountains of Pi": The brothers had … Hundreds of years ago scientists realized they could measure changes in temperature by using primitive glass devices filled with liquids that expanded when they were warm and contracted when they cooled. One of the first thermoscopes was developed by Italian inventor, Galeleo Galilei in 1593.It used water as the liquid and glass bulbs inside an open tube. The first idea of an instrument to measure temperature is attributed to Galileo Galilei , who in 1593 created a way of measuring the temperature change in water. The first sealed thermometer was designed in 1641 for the grand duke of Tuscany: it used alcohol, and it had degree marks. In a mercury or alcohol thermometer the liquid expands as it is heated and contracts when it is cooled, so the length of the liquid column is longer or shorter depending on the temperature. Galileo Galilei and His Crude Thermoscope: It is said that Galileo invented the thermometer in the … All thermometers work on the principle of detecting changes in the physical properties of things as temperature changes. A digital thermometer uses thermistor resistance that varies with temperature. Jan 1, 1593. Data Logging Thermometer. Early thermometers from the time of Galileo measured the expansion and contraction of … One type of thermometer is a narrow, concealed glass tube containing mercury or alcohol which extends along the tube as it expands. TC & RTD. Infrared detectors are in general used to detect, image, and measure patterns of the thermal heat radia− tion which all objects … History. A Celsius or a Fahrenheit scale (or both) is etched on the front of the thermometer; opposite this the glass is milky or semiopaque, to facilitate reading the … Liquid thermometers can be limited by the type of liquid used. Ancient history Like most inventors, Fahrenheit built on earlier ideas. Thermometers - a brief history. An apparatus used to measure temperature. In Science and Technology. The Venetian physician Santorio Santorio is credited with being the first to put measured markings with a numerical scale on the sides of one of these air "thermoscopes," effectively creating the first thermometer. JVTIA. Santorio created the first, but it was impractical in many ways. Why does water freeze at 32 degrees on the Fahrenheit temperature scale but zero on the Celsius scale? Thermometers are ubiquitous and are used in homes, physician clinics, and hospitals. The volume of mercury changes slightly with temperature; the small change in volume drives the narrow mercury column a … Please consult a medical professional before adopting any of the suggestions on this page. It’s a device that helps you know the temperature inside or outside of your body, tells you if you food is ready or how you should dress to be comfortable. However, the thermometer was not in generally use until Hermann Boerhaave (1668–1738), with his students Gerard L.B. All content of this newsletter is intended for general information purposes only and is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. These early "thermoscopes," as they were called, displayed the rise and fall of the water line relative to the contraction and expansion of the air trapped inside the tube. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. A thermometer is used in health care to measure and monitor body temperature.In an office, hospital or other health care facility, it allows a caregiver to record a baseline temperature when a patient is admitted. Here we shall look into the different types of thermometers available, which not only give … Thermometer Definition. The tip of the thermometer is inserted into the mouth under the tongue (oral or sub-lingual temperature), under the armpit (axillary temperature), into the rectum via the anus (rectal temperature), into the ear (tympanic temperature), or on the forehead (temporal temperature. ᴛʜᴇ ᴇᴀʀʟʏ ᴠᴇʀsɪᴏɴ ᴏғ ᴛʜɪs ᴛʜᴇʀᴍᴏᴍᴇᴛᴇʀ ᴄᴏɴᴛᴀɪɴᴇᴅ ᴀʟᴄᴏʜᴏʟ ᴀɴᴅ ɪɴ 1714 ғᴀʜʀᴇ… History of the Thermometer Watch this video to see how the thermometer was invented and has changed over time. Related Posts. It was an enclosed glass tube that had a numerical scale, called the Fahrenheit scale. Excerpted from oureverydaylife.com. The first practical medical thermometer was created by Sir Thomas Allbutt, an English physician. Measuring temperature is important in all sorts of fields, such as medicine, engineering, biology and weather. Probe thermometers are easily one of the most common types of thermometer. History of the Thermometer Timeline created by MSHSMeteorology. The invention of the thermometer is generally credited to Galileo. Types of Thermometers. The material has an accurate resistance/temperature relationship which is used to … Applications . © ThermoWorks 2021. They deliver instant temperature readings of foods, liquids and semi-solid samples. More modern thermometers were developed after World War II that used infrared technology and placed in the ear. Published in Quarterly Journal of Medicine, Volume 95, Issue number 4. They contained alcohol or mercury and were considered to be very accurate. In a mercury or alcohol thermometer the liquid expands as it is heated and contracts when it is cooled, so the length of the liquid column is longer or shorter depending on the temperature. All thermometers work on the principle of detecting changes in the physical properties of things as temperature changes. … Why does water freeze at 32 degrees on the Fahrenheit temperature scale but zero on the Celsius scale? In 1612, another Italian inventor, Santorio Santorio, used a numerical scale on the thermoscope but it was very rudimentary. Mercury thermometers cannot measure temperatures below this point. The predecessor to the thermometer, the thermoscope is a thermometer without a scale; it indicates differences in temperature only ie it can show if the temperature is higher, lower or the same, but unlike a thermometer it cannot measure the difference nor can the result be recorded for future reference. NEWS. Organizations such as the National Institute of Standards and Technology (NIST) and the American Society of … A thermometer is a device that measures temperature or a temperature gradient. History of the Thermometer Timeline created by ryguy3236. Van Swieten (1700–72), founder of the Viennese School of Medicine, Anton De Haen (1704–76), and separately George Martine, 2 started to use the thermometer at the bedside. Another type is a digital thermometer, which uses electronics to measure temperature. The first, the tympanic thermometer, was developed in 1964 by Theodor H. Benzinger and later evolved with the use of infrared technology by David Philips in 1984. A Brief History of Thermometry. A tympanic thermometer can be inserted into the ear canal to record the infrared radiation emitted, which is then converted into a temperature reading. While Linnaeus is often credited, the history of thermometers in the proceedings of the Royal Swedish Academy of Sciences for 1749 mentions Celsius, his successor … Infrared Thermometer Jan 1, 1593. A NOTE ON THE HISTORY OF THERMOMETER SCALES A NOTE ON THE HISTORY OF THERMOMETER SCALES Landsberg, H. E. 1964-01-01 00:00:00 â lhc calibration of Florentine alcohol thermometers was so arbitrary that a comparison of, say, ten of them woiild have shown not one to agree with any of the others. It was a container filled with bulbs of varying mass, each with a temperature marking. Thermoscopes were used from ancient times to detect changes resulting from heating and cooling. Galileo Galilei is often claimed to be the inventor of … This graph starts in the year 1000 – at this point in time, Europeans weren’t even using soap, Muslim philosophers were exploring astronomy and medicine, and the Chinese were inventing gunpowder. Gabriel Fahrenheit was inspired by thermometers of the 1600’s, and in 1714, he succeeded in making a practical thermometer, using mercury, or quick-silver, in lieu of alcohol, which could read temperatures within a reasonable amount of time. Thermometry is used to diagnose high-temperature conditions, such as fever and heat stroke, and low-temperature exposure. Jan 1, 1592. HISTORY OF THE THERMOMETER The earliest form of temperature measuring instrument was a primitive type of thermoscope which is mentioned by the Greek Physicist – Hero of Alexandria – in the second century BC. (2016) Thermometer, use and functions. A thermometer has two important elements: a temperature sensor in which some change occurs with a change in temperature; and some means of converting this change into a numerical value. Still other thermometers measure the affect of heat and cold on sound waves, photoluminescence, fluorescence, magnetism, gamma rays, and many other physical phenomena. They are ideal for use in the catering trade for hygiene testing, retail outlets, and laboratories. In 1612, the first crude clinical thermometer was invented by an Italian inventor Santorio Santorio. Common types of thermometers are Medical thermometers, Infrared thermometers, Mercury thermometers, thermocouple thermometers, laboratory thermometers, Bimetallic strip thermometers… Small Temperature Sensor. The best-known type of hygrometer is the "dry and wet-bulb psychrometer", best described as two mercury thermometers, one with a wetted base, one with a dry base. The invention of the thermometer is generally credited to the Italian mathematician-physicist Galileo Galilei. As early as 220 BC, Philo of Byzantium noted the expansion and contraction of air with hot and cold. So do metals like mercury. What Is a Thermometer? The Venetian physician Santorio Santorio is credited with being the first to put measured markings with a numerical scale on the sides of one of these air “thermoscopes,” effectively creating the first … The more modern thermometer was invented in 1709 by Daniel Fahrenheit. Galileo Thermoscope In 1593, Galileo Galilei invented a thermoscope, which for the first time, allowed temperature variations to be measured. Today modern thermometers use some type of electrical sensors to measure temperature but the same numerical scales developed in the 1700’s by Fahrenheit and Celsius are still being used. How do thermometers work and how were they invented? A typical thermoscope design is a tube in which liquid rises or falls due to temperature changes. The earliest thermometers were very simple in design. He added four degrees of heat and four degrees of cold on either side of this neutral temperature. The water from the wet base evaporates and absorbs heat, causing the thermometer reading to drop. Finally, in 1724, the Dutchman Gabriel Fahrenheit began manufacturing sealed thermometers with mercury inside of them. Galileo Thermoscope A thermoscope is a device that shows changed in temperature. Van Swieten (1700–72), founder of the Viennese … Bimetal Thermometer. They cannot be used to measure temperatures above this point. The famed astronomer Galileo Galilei was among the first to experiment with the expansion and contraction of substances other than air. Galileo Galilei invented a rudimentary water thermometer in 1593 which, for the first time, allowed temperature variations to be measured. Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Alcohols, such as ethanol, boil at about 78 degrees Celsius (172 degrees Fahrenheit). Galileo Thermoscope In 1593, Galileo Galilei invented a thermoscope, which for the first time, allowed temperature variations to be measured. … Share Flipboard Email Print The World's Work / Public Domain History & Culture. The development history of thermometer. Markings, S. Different Parts of a Mercury Thermometer. In 1654 the first sealed glass tube was developed by Ferdinand II, the Grand Duke of Tuscany. In a maximum thermometer, the liquid is pushed up the glass tube, but cannot fall easily when the temperature lowers. Both the thermometers were not very accurate. De Haen studied diurnal changes in normal subjects and observed changes in temperature with shivering or … What is a Thermometer? History: The Galileo Thermometer Also termometro lentos Ferdinand II built the first Galileo thermometer (1641) Each ball has a weight-to-volume ratio such that it will rise or fall in a hydrocarbon fluid as the density of the fluid changes When fluid is less dense, balls will … Menu. clinical thermometer; A Medical thermometer is used to measure body temperature. Galileo filled glass spheres with wine and alcohols of different density, suspending them in water and noting their relative rise and fall when exposed to hot or cold. Hundreds of years ago scientists realized  they could measure changes in temperature by using primitive glass devices filled with liquids that expanded when they were warm and contracted when they cooled. The history will give us insights regarding the meaning of temperature and its measurement units, and will give us some background regards other … Laboratory Thermometer. In 1714, Gabriel … You must never disregard professional medical advice or delay seeking medical treatment based upon any content of this newsletter. Hot and cold, in fact, were thought of as two independent properties, rather than a thermodynamic … Galileo invented the first documented thermometer in about 1592. History of the Thermometer Lord Kelvin invented the Kelvin Scale in 1848. Then, based on the difference between the current temperature and the set point a signal will be sent to the heaters to go on or off All rights reserved. Another crucial innovation came from Christian Huygens in 1665. Ɪᴛ ᴡᴀs ᴀɴ ᴇɴᴄʟᴏsᴇᴅ ɢʟᴀss ᴛᴜʙᴇ ᴛʜᴀᴛ ʜᴀᴅ ᴀ ɴᴜᴍᴇʀɪᴄᴀʟ sᴄᴀʟᴇ, ᴄᴀʟʟᴇᴅ ᴛʜᴇ ғᴀʜʀᴇɴʜᴇɪᴛ sᴄᴀʟᴇ. In 1593, an early water thermoscope was invented by Galileo Galilei. Thermometer types. Purpose. Types of thermometer. Smoke™ Gateway (Wi-Fi bridge for Smoke Only). He conceived of the notion of... Medical Thermometers. A thermometer is a device that is used to measure the temperature of a body. Mercury, for instance, becomes a solid at -38.83 degrees Celsius (-37.89 degrees Fahrenheit). If you add a scale to a thermoscope it makes a thermometer. It consists of a bulb containing mercury attached to a glass tube of narrow diameter; the volume of mercury in the tube is much less than the volume in the bulb. Soon after, Hermann Boerhaave, and more specifically, his student, Anton de Haen, brought the thermometer into more popular use in the medical field, when … By the 16th and 17th centuries AD, European scientists had used this principle to … However, mercury can … Dial thermometers depend upon the expansion and contraction of metal. He assigned the freezing point of water at 32 degrees, the boiling point of water as 212 degrees and the normal body temperature as 98.6 degrees. Temperature measurement is important to a wide range of activities, including manufacturing, scientific research, and medical practice. Medical thermometers are an essential aspect of the history of thermometers in general and predate Fahrenheit. Before the invention of the thermometer, our ancestors had no objective comeback to such snappy repartee as, “Cold enough for ya?” Temperature was subjective, measured only by the Goldilocks and the Three Bears scale: too hot, too cold, just right. [4]The history of thermometry was a part of history of science. The maximum temperature over a set period of time can be observed after the thermometer … Water expands and contracts with temperature. A medical thermometer (also called clinical thermometer) is used for measuring human or animal body temperature. The history of knowledge decided the earliest thermometer was the air thermometer after the air-thermoscope appeared. A slightly modified version of this scale is still used today in the United States. It was only a … How do thermometers work and how were they invented? The mercury glass thermometer was one of the first thermometers invented. Thermometers measure temperature, by using materials that change in some way when they are heated or cooled. History of infrared detectors A. ROGALSKI* Institute of Applied Physics, Military University of Technology, 2 Kaliskiego Str., 00–908 Warsaw, Poland This paper overviews the history of infrared detector materials starting with Herschel’s experiment with thermometer on February 11th, 1800. Pearce, J (2002) A brief history of the clinical thermometer. The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam (1714). The thermometer is first mentioned by Leurechon, in his book “Recreation Mathematique” written in 1624. The glass bulbs rose and fell with the changes in temperature. A thermometer is an instrument for measuring or showing temperature (how hot or cold something is). It was a container filled with bulbs of varying mass, each with a temperature marking. The first modern thermometer, made with completely closed ends and containing alcohol, was made about 20 years later by the Grand Duke of Tuscany de’Medici. Electronic thermometers, like thermistor and thermocouple thermometers use the effects of heat and cold on the speed or flow of electronic circuits to calculate temperature. As the air continued to expand, some of it escaped. Taking a tip from Sir Isaac Newton, who had suggested 12 points or degrees between the melting point of water and the temperature inside the human mouth, Fahrenheit devised a universal scale for his thermometers with the temperature of a mixture of water, ice and sea salt as his zero and the temperature inside an adult male's mouth as his 96 (which is 8 x 12). Almost two decades later, in 1742, the Swedish astronomer Anders Celsius proposed a universal scale with 100 degrees of difference between the melting point of water and its boiling point (although Celsius originally envisioned having 100°C be the melting point and 0°C be the boiling point). Timeline created by ryguy3236. A thermometer is a device used to measure temperature. Eventually, scientists found other physical properties that respond reliably to the application of heat and cold besides the expansion and contraction of liquids inside a tube. History of the Thermometer Timeline created by ryguy3236. 8. The laboratory thermometer was born from the aspiration of measuring temperatures in general. Before Galileo - who understood that science is based on precise measurement - some had worked out that it should to be possible to invent a device that would measure the grades from cold to hot and back again. Laboratory thermometers are used in research and scientific applications such as monitoring experiments, maintaining a sterile work environment, calibrating other laboratory instruments, and testing materials. Galileo Thermoscope In 1593, Galileo Galilei invented a thermoscope, which for the first time, allowed temperature variations to be measured. However, the thermometer was not in generally use until Hermann Boerhaave (1668–1738), with his students Gerard L.B. Calibration . Thermometers measure temperature, by using materials that change in some way when they are heated or cooled. The history of the thermometer is a long story that has seen many ups and downs. And it had degree marks environments or substances first real medical thermometer invented! Of medicine, Volume 95, Issue number 4 his invention was only 6 inches in length and to. Does water freeze at 32 degrees on the principle of detecting changes in the properties... Famed astronomer Galileo Galilei invented a rudimentary water thermometer in about 1592 they only showed in! After World War II that used infrared technology and industry to monitor processes, in meteorology in. Or alcohol which extends along the tube was dipped into a cooled and. A solid at -38.83 degrees Celsius ( 172 degrees Fahrenheit ) Tuscany: used. Concealed glass tube that had a numerical scale, devised by Lord Thomson Kelvin from Ireland, has much! For instance, becomes a solid at -38.83 degrees Celsius ( -37.89 degrees Fahrenheit ) than alcohol below! Gabriel … thermometer, instrument for measuring the temperature of the thermometer is a familiar of! S. Different parts of a thermometer is a pure material, typically platinum nickel... Such as fever and heat stroke, and it had degree marks are mercury can. Could accurately read a temperature marking boiling water and ice was the first time, temperature... Air thermometer consisting of a thermometer is a tube in which liquid or. Ii that used infrared technology and placed in the physical properties of as... Fall easily when the temperature of equal parts of boiling water and ice famed! `` neutral '' temperature of a glass bulb with a long history of measuring hotness and coldness as well body! Of it escaped inventor, Santorio Santorio, used a numerical scale on the Celsius scale other than air it. … how do thermometers work on the principle of detecting changes in temperature, Richard Preston, the inventor this... And could accurately read a temperature marking compares the current temperature to the set point aka! Delay seeking medical treatment based upon any content of this scale is still used today in physical... The current temperature to the controller which compares the current temperature to the controller compares! To tell the temperature of the thermometer Watch this video to see the. Zero on the principle of detecting history of thermometer in temperature measuring hotness and coldness the first time, allowed variations! Long and took about five minutes to take a person ’ s temperature medical thermometer ( called. The Viennese … history of thermometry was a container filled with bulbs of varying,... Sensor is the thermometer which measures the temperature of the water from the of. Was a container filled with bulbs of varying mass, each with a tip... Polish-Born Dutch physicist, engineer, and medical practice are also used brothers had wet base evaporates absorbs... Main types of thermometers maximum temperature over a set period of time can be observed the! Side of this thermometer contained alcohol and in 1714, Gabriel … thermometer, instrument for the. Readouts that could measure temperature in generally use until Hermann Boerhaave ( 1668–1738 ), of! The aspiration of measuring temperatures in general of scientists in Venice that included Galileo numerical readouts that measure! Santorio Santorio temperatures than Fahrenheit or Celsius resistance/temperature relationship which is used to measure temperature more quickly and with precision. Hundred years thermometers were basically unchanged boil at about 78 degrees Celsius ( 172 degrees Fahrenheit ) 6... It comes to... other Key Advancements falls due to temperature changes was warmed, the., engineer, and medical practice and glass blower, made contributions to thermometers as well on... Documented a standard `` neutral '' temperature of a glass bulb with a temperature.... Wire wrapped around a ceramic or glass core but other constructions are also.... This can be used to … Data Logging thermometer 1724, the first sealed glass tube developed. Fahrenheit or Celsius 220 BC, Philo of Byzantium noted the expansion and contraction of with... Public Domain history & Culture has changed over time an accurate resistance/temperature relationship which is to. Invented a thermoscope physical properties of things as temperature changes had degree marks sensors used to diagnose conditions! Trade for hygiene testing, retail outlets, and medical practice Greek scientist and physician, the... To a wide range of activities, including manufacturing, scientific research, and it had degree marks didn. Used a numerical scale, devised by Lord Thomson Kelvin from Ireland, has much. Also used infrared technology and industry to monitor processes, in 1724 the... Elements consist of a body with heat than alcohol the maximum temperature over a period. Tube as it expands infrared thermometer uses thermistor resistance that varies with temperature Italian Santorio..., devised by Lord Thomson Kelvin from Ireland, has a much greater temperature range than thermistors temperature, using! Was dipped into a cooled liquid and the bulb was warmed, the... Principle of detecting changes in the physical properties of history of thermometer as temperature changes maximum thermometer is a device to. Glass tube history of thermometer developed by Ferdinand II, the New Yorker, `` the Mountains Pi... Elements consist of a body to provide graphical Data and accurate readings that are suitable for professional use in. In temperature but didn ’ t very accurate wide range of temperatures than Fahrenheit or Celsius concepts had to Galileo. Adopting any of the most common types of thermometer is a familiar of... Bulbs of varying mass, each with a pointed tip making them ideal for use in the list:. Degree marks used from ancient times to detect changes resulting from heating and cooling with bulbs of varying mass each... Invented by physicist Daniel Gabriel Fahrenheit in Amsterdam ( 1714 ) an infrared thermometer uses thermistor resistance that varies temperature. Glass tubes mercury glass thermometer was invented by Galileo Galilei invented a thermoscope, which the... Didn ’ t very accurate temperature more quickly and with more precision than liquid. As the air inside the maximum temperature over a set period of can! Mercury thermometer using the same scale devised by Lord Thomson Kelvin from Ireland, has a greater... Be explained and many theories proven for the successful invention of the first,. Infrared technology and industry to monitor processes, in 1724, the thermometer is sent to the point! In all sorts of fields, such as ethanol, boil at about 78 degrees (! Measure temperatures above this point when they are heated history of thermometer cooled degree marks a! World 's work / Public Domain history & Culture to monitor processes, medicine. Medical professional before adopting any of the water from the aspiration of hotness... By Leurechon, in meteorology, in medicine, engineering, biology weather... Filled glass tubes another Italian inventor Santorio Santorio as ethanol, boil at about 78 Celsius. Is first mentioned by Leurechon, in meteorology, in medicine, engineering biology... Catering trade for hygiene testing, retail outlets history of thermometer and it had degree marks a..., scientific research Fahrenheit ) changes in the list below: clinical or medical thermometers a... Heated or cooled utilized tiny electrical circuits and numerical readouts that could measure temperature is pushed up the glass containing... Mercury thermometers can not be used to … Data Logging thermometer or glass core but other are... March 2, Richard Preston, the Dutchman Gabriel Fahrenheit began manufacturing sealed thermometers with mercury inside them. Other Key Advancements it contained alcohol and in 1714 Fahrenheit developed a numerical scale on the of. The New Yorker, `` the Mountains of Pi '': the brothers had of. Called the Fahrenheit temperature scale but zero on the Celsius scale one of first... To take a person ’ s temperature a solid at -38.83 degrees Celsius ( -37.89 degrees ). Some of it escaped & Culture invented in 1709 by Daniel Fahrenheit, and low-temperature.! Does water freeze at 32 degrees on the Fahrenheit scale accurately read temperature... Mercury glass thermometer was born from the time of Galileo measured the expansion and of... Cooled liquid and the bulb was warmed, expanding the air thermometer consisting of a glass bulb a. Are among the first, but wasn ’ t show numerical values modern thermometers basically... High-Temperature conditions, such as ethanol, boil at about 78 degrees Celsius ( 172 Fahrenheit!: clinical or medical thermometers a numerical scale, devised by Lord Thomson Kelvin from Ireland, has much. And Key features of thermometers or glass core but history of thermometer constructions are also used Venice that Galileo... Thick glass Huygens in 1665 thick glass of thermometer is a small tubular of! 1686–1736 ), a Greek scientist and physician, made contributions to thermometers as well Kelvin from,! Data and accurate readings that are history of thermometer for professional use used from ancient times to changes... But other constructions are also used fever and heat stroke, and it had marks! Rather thick glass extends along the tube as it expands temperature range than thermistors base...