What does BTU stand for?

BTU stands for British Thermal Unit. It is a traditional unit of heat energy that describes the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit at a constant pressure. This measurement is commonly used in various fields, including heating and cooling systems, to provide an indication of the energy output or consumption of such systems.

The other options do not correctly reflect the meaning of BTU. British Tornado Unit, British Temperature Unit, and British Transmission Unit are not recognized standard units in thermodynamics or related fields. Understanding BTU is essential in contexts such as HVAC (heating, ventilation, air conditioning) to assess energy requirements and efficiency.