1. Latent Heat and Phase Changes

2. 3 Phases of Matter Solid, Liquid, and Gas
Water can transfer from one phase to the next if you simply add or remove energy (heat)

3. Boiling
Boiling is when a liquid is changing phase to a gas (vaporization).
Addition of Heat

4. Boiling Point A particular temperature that a substance boils.
Water = 212F and 100C

5. Freezing
When a liquid changes phases to a solid.

6. Freezing Point A temperature at which a substance Freezes
Water = 32F and 0C

7. Melting Point
Temperature at which a substance Melts from Solid  Liquid
Ice = 32F and 0C

8. Latent Heat during Phase change
The energy used to change the phase of the material.

9. Where does the heat go?
There is no temperature change on graph yet, heat is put into the material. The heat is absorbed by molecules to change phase.

10. Latent Heat Two types of latent heat Heat of fusion
Heat of vaporization

11. Heat of Fusion Is the heat required to change a solid into a liquid.
Melting

12. Heat of Vaporization Heat used to change a liquid to a gas.
Evaporation or boiling

13. Latent Heat (ESRT pg. 1)
Latent Heat is gained (absorbed) during melting (334 Joules/gram)
Latent Heat is released during freezing (334 Joules/gram)
Latent Heat is gained (absorbed) during vaporization (2260 Joules/gram)
Latent Heat is released during condensation (2260 Joules/gram)