A quart of water is 946.35 cubic centimeters and since density of water is 1 gram per cubic centimeter the weight of a quart of water is 946.35 grams.
Heat required = (mass) x (specific heat of substance) x (temperature differential)
In our case it would be 946.35 x 1 x 38(assumed degrees centigrade) = 35961.3 cals
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100 calories. 1 calorie is defined as the amount of energy required to raise the temperature of 1 gram of 1 by 1 degree Celsius. So, if you need to raise 10 grams of water 1 degree, you would need 10 calories of energy. If you needed to raise those same 10 gram by 10 degrees, you'll need 10 * 10, or 100 calories.
300
25
Pure water contains no calories.
212-65=147. 147(20)=2940 btu needed is this right?