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Quick BTU question

  1. Sep 1, 2015 #1
    I know that 1 BTU is energy needed to raise 1lb of water 1 fahrenheit.

    Does that also mean that if I were to lower the temp of 1lb of water by 1 fahrenheit that I have used 1 BTU of energy?

    Does it apply both ways?
  2. jcsd
  3. Sep 1, 2015 #2


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    Science Advisor

    To raise the temperature of something you need to add energy, to lower the temp you need to remove energy.
    So to lower the temp of 1lb of water by 1 Fahrenheit you need to remove 1 BTU of energy from the water.
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