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Fahrenheit |
A temperature scale invented in the early 1700s by German Gabriel Daniel Fahrenheit - who also invented the mercury thermometer. It has a zero point defined by the steady temperature of a mixture of water, ice and salt. His 'degrees' were arbitrary measures, derived from those of earlier alcohol thermometers. The freezing point of water is 32F, and its boiling point is 212F. Fahrenheit originally measured the stable temperature of the human body as 96 degrees - after his death others refined the scale, and re-measured body temperature as 98.6F |
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Celsius |
A temperature scale designed by the Swedish astronomer Anders Celsius, setting the freezing point of water as 0C, and the boiling point of water as 100C. It was commonly known as the Centigrade scale, but was renamed in 1948 in honour of its inventor. |
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Kelvin (Absolute) |
A temperature scale named in honour of the British physicist Lord Kelvin (William Thomson). It has a unit equal to the Celsius, but with a zero point called 'absolute zero' - the theoretical low point temperature at which there is insufficient energy to support the internal movement of atoms - Kelvin predicted this to be -273C. Subsequent scientific advance has shown that true absolute zero is actually around -273.15C, but the Kelvin scale conventionally starts at exactly -273C. |
To convert between centigrade and Fahrenheit or vice-versa, enter the value you want to convert into the text box, and click the appropriate conversion button.
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F = (C x 9 / 5) + 32
C = (F - 32) x 5 / 9
K, = C + 273
| -40C | -40F |
| 0C | 32F |
| 16C | approximately 61F |
| 28C | approximately 82F |
| 37C | 98.6F - "normal" human body temperature |
| 38C | approximately 100F |
| 100C | 212F |
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