![]() Many physical processes are related to temperature some of them are given below: ![]() Temperature is important in all fields of natural science, including physics, chemistry, Earth science, astronomy, medicine, biology, ecology, material science, metallurgy, mechanical engineering and geography as well as most aspects of daily life.Įffects Average daily variation in human body temperature It would be impossible to extract energy as heat from a body at that temperature. Experimentally, it can be approached very closely but not actually reached, as recognized in the third law of thermodynamics. ![]() The kelvin is one of the seven base units in the International System of Units (SI).Ībsolute zero, i.e., zero kelvin or −273.15 ☌, is the lowest point in the thermodynamic temperature scale. The most common scales are the Celsius scale with the unit symbol ☌ (formerly called centigrade), the Fahrenheit scale (☏), and the Kelvin scale (K), the latter being used predominantly for scientific purposes. Thermometers are calibrated in various temperature scales that historically have relied on various reference points and thermometric substances for definition. Temperature is measured with a thermometer. Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness.
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