What does BTU stand for in energy measurement?

BTU stands for British Thermal Unit. This is a unit of measurement used to quantify the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit at a constant pressure. The BTU is commonly used in various fields, including heating, cooling, and energy production, making it an important concept in energy management and utilities. Understanding BTUs helps professionals assess energy needs and efficiency in systems such as heating and air conditioning. The other terms provided do not have established meanings in the context of energy measurement, making "British Thermal Unit" the appropriate answer.