Celsius as a unit and a scale was not widely used until this original definition was inverted. In , the unit, "degree Celsius," as well as the Celsius scale were again re-defined to instead be based on absolute zero This is the definition that was used up until , when the kelvin was redefined based on the definitions of the second, meter, and kilogram.
Current use: The Celsius scale replaced the Fahrenheit scale in most countries in the mid to late 20 th century. Almost all countries around the world use this scale, except for those in which the metric system has not been adopted, such as the United States.
Featured Video. Cite this Article Format. Helmenstine, Anne Marie, Ph. Body Temperature Conversion Problem. Celsius to Kelvin Temperature Conversion Example. Convert Temperature from Kelvin to Celsius and Back. Temperature Conversion Test Questions. Your Privacy Rights. To change or withdraw your consent choices for ThoughtCo. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data.
Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have used various reference points and thermometric substances for definition. The lowest theoretical temperature is absolute zero, at which no more thermal energy can be extracted from a body. Experimentally, it can only be approached very closely, but not reached, which is recognized in the third law of thermodynamics.
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