# Heat energy removed

## Main Question or Discussion Point

What is the heat energy removed from a liquid when vapor is no longer present. This has been bugging me all day. I was thinking latent heat of sublimation cause ice seems to just melt in a ice machine due to door opening and closing and heat from air . Next guess was latent heat of fusion

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mathman
You need to better describe the scenario you are thinking about. In general if something is warmer than its surroundings it will lose heat.

True so It would be subcooling . Sublimation is the process of ice becoming water vapor without first going through a liquid stage.

Subcooling is reducing the temperature of a liquid below its boiling point. If you have water sitting in a pan on the stove in your house, it is subcooled liquid water. It is below 212°F.
Subcooling...latent heat of fusion relates to melting/freezing point, condensing/boiling relate to latent heat of vaporization and sublimation is a direct change of state from solid to vapor.

256bits
Gold Member
What is the heat energy removed from a liquid when vapor is no longer present.
As mathman has asked, what condition do you have where there is no vapour present and only liquid.
For example, water in a pipe has no vapor present, and heat would be exchanged through the pipe walls via conduction, and perhaps convection, to the surroundings.

As mathman has asked, what condition do you have where there is no vapour present and only liquid.
For example, water in a pipe has no vapor present, and heat would be exchanged through the pipe walls via conduction, and perhaps convection, to the surroundings.
In an ac system condenser