Physics » Heat and Heat Transfer Methods » Phase Change and Latent Heat

# Summarizing Phase Change and Latent Heat

## Summary

• Most substances can exist either in solid, liquid, and gas forms, which are referred to as “phases.”
• Phase changes occur at fixed temperatures for a given substance at a given pressure, and these temperatures are called boiling and freezing (or melting) points.
• During phase changes, heat absorbed or released is given by:

$$Q=\text{mL,}$$

where $$L$$ is the latent heat coefficient.

## Glossary

### heat of sublimation

the energy required to change a substance from the solid phase to the vapor phase

### latent heat coefficient

a physical constant equal to the amount of heat transferred for every 1 kg of a substance during the change in phase of the substance

### sublimation

the transition from the solid phase to the vapor phase