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|Temperature Unit Conversions|
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|Unit||Equivalent measurements, comments|
|Celsius scale||This scale sets the normal freezing point of water to 0 degrees Celsius and the normal boiling point of water to 100 degrees Celsius. Formerly called the Centigrade scale. A change of 1 degree Celsius equals a change of 9/5 = 1.8 degrees Fahrenheit. To convert a Celsius temperature to Fahrenheit, multiply by 9/5 and add 32. To convert a Celsius temperature to Kelvin, add 273.15|
|Kelvin scale||This scale sets the lowest obtainable temperature (absolute zero = the temperature at which all molecular motion completely ceases) to 0 degrees. A change of one degree Celsius = a change of one Kelvin, but a Celsius temperature is never equal to a Kelvin temperature. There are no negative temperatures in the Kelvin scale. To convert a Kelvin temperature to Celsius, subtract 273.15. Note: simply use "Kelvin" or "Kelvins", not "degrees Kelvin" when using this unit.|
|Fahrenheit scale||This scale sets the freezing point of water to 32 degrees Fahrenheit and the boiling point of water to 212 degrees Fahrenheit. A change of 1 degree Fahrenheit equals a change of 5/9 = 0.56 degrees Celsius. To convert a Fahrenheit temperature to Celsius, subtract 32 and multiply by 5/9.|
|Rankine scale||This is the Fahrenheit analog of the Kelvin scale. Absolute zero is set to zero and each change of one degree Rankine = a change of one degree Fahrenheit, but a Rankine and Fahrenheit temperature are never equal. Like the Kelvin scale, the Rankine scale has no negative temperatures.|
|Réaumur scale||This is an obsolete temperature scale where the freezing point of water is zero degrees Réaumur and the boiling point of water is 80 degrees Réaumur.|
|Notable Temperatures On The Various Temperature Scales|
|Note: All measurements are at 1 atm of pressure. See also: boiling point and freezing point.|
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