Hands-On-Physics
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Physics
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- Important Terminology - |
HEAT UNITS
Calorie:
A calorie is defined as the amount of energy required to increase the temperature
of a gram water by one degree Celsius. This is equivalent to 4.184 Joules. If you
count "calories" when you eat, you are actually counting kilocalories.
That is, the "calorie" used in measuring food energy is actually one thousand
of the calories we just defined. (... so much for consistency)
British Thermal Unit (BTU):
A BTU is the amount of energy required to increase the temperature of one
pound of water by one degree Fahrenheit. This is equivalent to 1055 Joules.
In the United States, the ability of furnaces to warm the air by adding energy and
the ability of air conditioners to extract energy from air
is expressed in BTUs.