A BTU is defined as the amount of heat required to raise the temperature of one pound of water by how many degrees?

A BTU, or British Thermal Unit, is specifically defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. This unit of measurement is commonly used in heating and cooling systems to quantify energy.

Understanding that a BTU is tied to water and temperature change emphasizes its practical application in everyday heating scenarios, such as in HVAC systems and other engineering contexts. The choice that indicates a temperature increase of one degree Fahrenheit is thus the correct response, as it aligns with the standard definition of a BTU.

In contrast, other temperature scales mentioned, such as Celsius and Kelvin, do not apply in the context of defining a BTU. Celsius and Kelvin are metric measures, and while they relate to temperature, the specific definition of a BTU centers around the Fahrenheit scale.