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Thermodynamics and Statistical Mechanics

How many calories of heat are released when 1 gram of water condenses?


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Answered 2012-09-17 04:18:24

The heat of evaporation of 1 gram of water at 100C at atmospheric pressure is 538.5 calories.

1 gram of water condensing from a 100% quality of saturation (dry steam) at 100C and atmospheric pressure releases 538.5 calories.

For lower quality the enthalpy is lower. Such that the latent heat of evaporation is reduced by the amount of moisture in the steam.

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You get about 2260 joules for every gram of water vapor that condenses.




To change water by one degree takes 80 calorie per gram. This means that the water releases 2800 calories when it shifts from 100 to 99 degrees Celsius.


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In case of FAT (9 calories per gram), CARBS (4 calories per gram) andPROTEIN (4 calories per gram)asonor.com