define latent heat
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Latent heat is the amount of heat to change the state of a substance at a constant temperature.
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Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process.
Latent heat is the heat energy per mass unit required for a phase change to occur. If we think about substances at a molecular level, gaseous molecules have more vibration than liquid molecules.
So when you add heat to a liquid, you are actually causing the molecules to vibrate. The latent heat is the energy required to change the molecular movement. Each substance has a unique latent heat value.
Formula for Latent Heat
The formula for latent heat is:
Q = m * L
This equation relates the heat Q that must be added or removed for an object of mass m to change phases. The object's individual latent heat is noted by L. The unit of latent heat is J/kg.
The values of latent heat are variable depending on the nature of the phase change taking place:
The latent heat of fusion is the change from liquid to solid.
The latent heat of vaporization is from liquid to gas.
The latent heat of sublimation is the change from solid to gas.
Latent heat is the heat energy per mass unit required for a phase change to occur. If we think about substances at a molecular level, gaseous molecules have more vibration than liquid molecules.
So when you add heat to a liquid, you are actually causing the molecules to vibrate. The latent heat is the energy required to change the molecular movement. Each substance has a unique latent heat value.
Formula for Latent Heat
The formula for latent heat is:
Q = m * L
This equation relates the heat Q that must be added or removed for an object of mass m to change phases. The object's individual latent heat is noted by L. The unit of latent heat is J/kg.
The values of latent heat are variable depending on the nature of the phase change taking place:
The latent heat of fusion is the change from liquid to solid.
The latent heat of vaporization is from liquid to gas.
The latent heat of sublimation is the change from solid to gas.
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