British-thermal-unit meaning

The quantity of heat required to raise the temperature of one pound of water from 60° to 61°F at a constant pressure of one atmosphere.
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The quantity of heat equal to1180 of the heat required to raise the temperature of one pound of water from 32° to 212°F at a constant pressure of one atmosphere.
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A unit of heat equal to about 252 calories; quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit.
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A unit used mainly to measure heat but also applied to other forms of energy. One British thermal unit is equal to the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit, or 251.997 calories.
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A unit of measure used when referring to natural gas. Technically, it is the quantity of heat required to raise the temperature of one pound of water from 60 to 61 degrees Fahrenheit at a constant pressure of one atmosphere. In the same way that ounces is the typical unit of measure used when pricing gold, B.T.U. is used when pricing natural gas.
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The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature (there are several different precise definitions) and a pressure of one atmosphere.
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