Massachusetts 2nd Class Fireman's Practice Exam

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What is required to raise the temperature of 1 lb of water from 32 degrees to 212 degrees Fahrenheit?

  1. 144 Btu

  2. 180 Btu

  3. 970.3 Btu

  4. Saturated heat.

The correct answer is: 180 Btu

To determine what is required to raise the temperature of 1 pound of water from 32 degrees to 212 degrees Fahrenheit, we need to understand the concept of specific heat. The specific heat of water is approximately 1 Btu/lb°F. This means that it takes 1 British thermal unit (Btu) to raise the temperature of 1 pound of water by 1 degree Fahrenheit. In this scenario, the temperature change is from 32 degrees to 212 degrees. This is a change of: 212°F - 32°F = 180°F Since it takes 1 Btu to raise the temperature of 1 pound of water by 1 degree, to increase the temperature by 180 degrees, it would require: 180°F * 1 Btu/lb°F = 180 Btu Thus, raising the temperature of 1 pound of water from 32°F to 212°F requires 180 Btu.

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