1 kg of water evaporation, need to how much a calorific value

If it is under a standard atmospheric pressure, water heat of vaporization of 40800 focal/Moore, equivalent to 2.26 million kilojoules/kg, so 1 kg of water evaporation need completely energy of 2260 j.

Joule (hereinafter referred to as focal, symbols for J), is the international unit of energy and power. 1 joule energy equivalent to 1 Newton power point in the direction of the force on the mobile 1 meter distance from the work done.

Symbol J to commemorate British physicist James was called Prescott, the joule. Coke = 1,, is equal to 1 watt power the work done in 1 seconds, 1 focal = 1, SEC.