What does the acronym BTU stand for?

The acronym BTU stands for British Thermal Unit. It is a traditional unit of heat defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit at constant pressure. This measurement is significant in various fields, especially in heating, ventilation, and air conditioning (HVAC), as well as in evaluating the energy content of fuels.

Understanding BTUs is crucial for those involved in energy management, as it allows for the assessment of heating capacities and energy consumption in different systems. The other options presented do not represent recognized units of thermal energy; hence their inapplicability in this context.