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| absolute zero |
the lowest possible temperature for any known substance, equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. |
| British thermal unit |
a unit of heat equal to the amount needed to raise the temperature of one pound of water one degree Fahrenheit, or equal to about 252 calories. (abbr.: Btu) |
| Btu |
abbreviation of "British thermal unit" or "British thermal units," a unit of heat equal to the amount needed to raise the temperature of one pound of water one degree Fahrenheit, or equal to about 252 calories. |
| F1 |
abbreviation of "Fahrenheit," of, pertaining to, or designating a temperature scale on which thirty-two degrees is the freezing point and 212 degrees is the boiling point of water. |
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