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Unit 5: Heat SPECIFIC HEAT CAPACITY AND LATENT HEAT.

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Presentation on theme: "Unit 5: Heat SPECIFIC HEAT CAPACITY AND LATENT HEAT."— Presentation transcript:

1 Unit 5: Heat SPECIFIC HEAT CAPACITY AND LATENT 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 40 o C to 5 o C. 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 ice @ 0 o C to water @ 0 o C (l fus = 3.3x10 3 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 water @ 100 o c to steam @ 100 o c? (l vap = 2.3x10 6 J/kg)

10 SOLUTION

11

12 LATENT HEAT APPLICATIONS Picnic coolers- ice in a cooler will absorb some heat from food keeping it @ 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


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