1. Specific Heat Capacity and Latent Heat
Unit 5: Heat

2. Specific Heat Capacity (c)
The quantity of heat required to raise the temperature of a unit of mass by a unit change in temperature

3. example
When 4.0 kg of water is cooled from 40oC to 5oC. How much heat energy is lost?

4. solution

5. assignment Specific heat practice problems
Lab: specific heat capacity in liquids

6. Specific Latent Heat
Is the quantity of heat energy required to change the state of a unit of mass of substance

7. Specific latent heat of fusion
The quantity of heat energy released when 1 kg of substance solidifies without changing temperature
Ex. how much heat energy is needed to change 2.0 kg of 0oC to 0oC (lfus= 3.3x103 J/kg)

8. Solution

9. Specific latent heat of vaporization-
is the quantity of heat energy needed to vaporize 1 kg of substance without changing its temperature
Ex. how much heat energy is needed to change 0.50 kg of 100oc to 100oc? (lvap= 2.3x106 J/kg)

10. solution

12. Latent Heat applications
Picnic coolers- ice in a cooler will absorb some heat from food keeping a cool temperature
Preventing frost damage-gardeners turn sprinklers on crops, because when the water hits the plants and starts to freeze it will actually release some heat to plant
Cooling off when wet- when you get out of a shower the water will use your body heat to vaporize (if you don’t dry off) and since heat has left your body, you will feel cooler

13. Do practice problems
Assignment- latent heat problems