B,  Thermodynamics

Btu Content

The amount of energy, measured in British thermal units (Btu), obtained from the burning of a volume of natural gas. One Btu is the quantity of heat required to raise the temperature of 1 lb. of water 1°F (-17.22°C) at standard atmospheric pressure. A cubic foot of natural gas on average gives off 1000 Btu, but the range of heating values is between 500 and 1500 Btu. Btu content often determines the price of natural gas.

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