What unit is used to measure heat?
There are several.
The calorie is used by scientists.
The B.T.U (B.Th.U. in UK) or British Thermal Unit is used by engineers.
The BTU (in UK only) or Board of Trade Unit is used by bureaucrats.
Note. The Calorie (otherwise kilocalorie) is used to measure the heat content of foodstuffs or fuels. Note also that the capitalisation of Calorie is the only indication that it is 1000 times bigger than the calorie.
Generally the degree, however there are different kinds of degree measurements. See http://en.wikipedia.org/wiki/Degree_(temperature) ======================= HONK ! Degrees are units of temperature, not heat. Heat is energy, and may be described in any unit of energy. Examples: calorie, Calorie, joule, BTU, newton-meter, foot-pound, dyne-centimeter, watt-second
The omission of "degree" indicates that it is not relative to an arbitrary reference point such as the Celsius and Fahrenheit scales, but rather an absolute unit of measure which can be manipulated algebraically (e.g. multiply by two to indicate twice the amount of heat). This is not actually the case. Temperature (regardless of its unit) is not at all "the amount of heat" (e.g. you can increase or decrease the temperature of a gas…