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One BTU is the energy required to raise one pound of water by one degrees. Therefore, your answer would be one half.
To heat 1 pound of water by 1 degree Fahrenheit, you need 1 British Thermal Unit (BTU). This is based on the definition of a BTU, which is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit at a constant pressure.
one BTU is approximately the amount of energy needed to heat 1 pound of water 1 degree Fahrenheit. Here is a start ; now find out how much a pound of water weighs then work through it.
It doesn't work that way. There is not a certain number of btus to raise air temperature. You would have to know how much air. A BTU is the British Thermal Unit. That is the amount of energy required to raise the temperature of one pound of water one degree F.
212 - 80 = 132 degrees temperature increase x 1 pound water = 132 BTU