Latent heat is the heat required to make a phase change. By phase change, I mean going from solid to liquid, or liquid to solid, or liquid to gas, etc. Remember that the latent heat of a substance is a constant (meaning that it doesn't change). In mathematical terms, the latent heat of fusion is represented by
One example of latent heat is the latent heat of fusion. The latent heat of fusion tells you how much energy it takes to go from 1 mole of solid substance to liquid, or vice versa. For water (
Another latent heat which you will need to be familiar with is the latent heat of vaporization. As you may or may not have already guessed, this is the energy it takes to go from 1 mole of liquid substance to gas, or vice versa. For water (
I know this answer is long. But bear with me please (I'm sorry). Remember that you won't always see the units
Now, let's get into the equations. The first one you will see is this:
The second one is this:
Just note that fus is the same as fusion, and vap is the same as vaporization.
In the above equations,
If there is ever a latent heat problem, then you will know because there won't be a temperature change involved. You know this because there is no
If there are any questions please leave a comment. I hope that helps (sorry for the long answer)!