Latent Heat of Water

More accurately:

"The specific latent heat of fusion of a substance is the amount of heat required to convert unit mass of the solid into the liquid without a change in temperature."

and

"The specific latent heat of vaporization is the amount of heat required to convert unit mass of a liquid into the vapour without a change in temperature."

I don't know which one you are looking for since you didn't specify, but I'm sure that you can find both values for water through an internet search.

Regards,

Mike

For fusion =334 Kj/Kg

For evaporation =2258 Kj/Kg

That took me less than a minute on google ! Anyway hope it helps , Kris

Latent heat of evaporation varies with saturation temperature/pressure, from 2501kJ/kg @ 0degC, through 2257kJ/kg @ 100degC to 0kJ/kg at the "critical point".

The correct reference document is a set of Steam Tables, available in many engineering textbooks and probably on the 'net as well.

http://en.wikipedia.org/wiki/Critical_point_%28thermodynamics%29

144 BTU/lb to change water to ice at 32 dF

970 BTU/lb to change water to steam at 212 dF at atmos press

from my head