The unit of heat required to raise the temperature of one pound of water by one degree Fahrenheit is

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Multiple Choice

The unit of heat required to raise the temperature of one pound of water by one degree Fahrenheit is

Explanation:
Heat added to water to produce a temperature rise is described by the specific heat. For water, the amount of energy needed to raise the temperature of 1 pound by 1 degree Fahrenheit is defined as one BTU, so this unit directly matches the scenario described. The BTU is the traditional energy unit used in English engineering systems, with 1 BTU ≈ 1055 joules. Other options describe different scales or substances—calories relate to 1 gram of water by 1 degree Celsius, joules are the SI unit of energy, and a therm is a much larger energy unit (about 100,000 BTU). Thus the appropriate unit for this measurement is the BTU.

Heat added to water to produce a temperature rise is described by the specific heat. For water, the amount of energy needed to raise the temperature of 1 pound by 1 degree Fahrenheit is defined as one BTU, so this unit directly matches the scenario described. The BTU is the traditional energy unit used in English engineering systems, with 1 BTU ≈ 1055 joules. Other options describe different scales or substances—calories relate to 1 gram of water by 1 degree Celsius, joules are the SI unit of energy, and a therm is a much larger energy unit (about 100,000 BTU). Thus the appropriate unit for this measurement is the BTU.

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