ESCO Air Conditioning Practice Exam

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The standard unit for measuring the quantity of heat in a substance is

BTUs
Calories
Joules
Kilowatts

The correct answer is: BTUs

The correct answer is A. BTUs. BTU, which stands for British Thermal Unit, is the standard unit for measuring the quantity of heat in a substance. It is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. BTUs are commonly used in the heating, ventilation, and air conditioning (HVAC) industry to measure the heating and cooling capacities of systems. Option B, Calories, is a unit of energy commonly used in nutrition to measure the amount of energy in food. Option C, Joules, is a unit of energy in the International System of Units (SI) and can also be used to measure heat, but BTUs are more commonly used in HVAC applications. Option D, Kilowatts, is a unit of power, not heat.