There are 3.966 BTU in a kilocalorie (kcal), and 1 kcal raises 1 kg of water 1 degree C, but to work through it:
1 BTU raises 1 pound of water 1 degree F, and 1 kg = 2.20 pounds, therefore:
2.20 BTU raises 1 kg of water 1 degree F, and 1 litre of water weighs 1 kg (basically), therefore:
2.20 BTU raises 1 litre of water 1 degree F, and a 1 degree change in F equals 5/9 degree C, therefore:
2.20 BTU raises 1 litre of water 5/9 degree C, therefore:
3.96 BTU raises 1 litre of water 1 degree C.
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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.
2250
That will completely depend on how much water there is.
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