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Thermometers measure temperature, by using materials that change in some way when they are heated or cooled. 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.


Temperature is a numerical representation of hot or cold compared against baselines, typically the point at which water freezes and boils. In most in instances, temperature measures how much heat ...


Tim Radford explains how Gabriel Fahrenheit, Anders Celsius and Lord Kelvin came to their own conclusions when it came to measuring heat and cold.


The first doctors to routinely take the temperature of their patients were: Hermann Boerhaave, Gerard L.B. Van Swieten founder of the Viennese School of Medicine, and Anton De Haen. These doctors found temperature correlated to the progress of an illness, however, few of their contemporaries agreed, and the thermometer was not widely used.


A thermometer is a device that measures temperature or a temperature gradient.A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the digital sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. the visible scale ...


A Brief History of Thermometry . All thermometers work on the principle of detecting changes in the physical properties of things as temperature changes. As early as 220 BC, Philo of Byzantium noted the expansion and contraction of air with hot and cold.


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 tympanic thermometer can be inserted into the ear canal to record the infrared radiation emitted, which is then converted into a temperature reading.


The duke crafted the first thermometer using a liquid (alcohol) sealed in a tube, the familiar form of thermometers today. Despite suggestions from scientists ranging from Christian Huygens to Isaac Newton, however, the successful combination of a sealed thermometer and an accurate temperature scale took another 60 years.


Early History The first thermometers were called thermoscopes and while several inventors invented a version of the thermoscope at the same time, Italian inventor Santorio Santorio was the first inventor to put a numerical scale on the instrument.


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. The thermometer is first mentioned by Leurechon, in his book “Recreation Mathematique” written in 1624.