Question

Question #f8bfc

Answer 1

Pounds, degrees Fahrenheit.

Explanation:

A British thermal unit, or Btu, is defined as the amount of heat needed to raise the temperature of `"1 lb"` of water by `1^@"F"`.

This means that if you have a `"1-lb"` sample of water at a temperature of, say, `77^@"F"`, you would need to supply it with `"1 Btu"` of heat in order to get its temperature to increase to `78^@"F"`.