Thermometers are calibrated in various temperature scales that historically have used various reference points and thermometric substances for definition. Temperature is measured with a thermometer. It is the manifestation of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy, when a body is in contact with another that is colder or hotter. Temperature ( / ˈ t ɛ m p ə r ə t ʃ ə r/ tem-per-uh-cher ) is a physical quantity that expresses hot and cold. Average daily variation in human body temperature
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