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Unit 5: Heat SPECIFIC HEAT CAPACITY AND LATENT HEAT

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SPECIFIC HEAT CAPACITY (C) The quantity of heat required to raise the temperature of a unit of mass by a unit change in temperature

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EXAMPLE When 4.0 kg of water is cooled from 40 o C to 5 o C. How much heat energy is lost?

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SOLUTION

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ASSIGNMENT Specific heat practice problems Lab: specific heat capacity in liquids

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SPECIFIC LATENT HEAT Is the quantity of heat energy required to change the state of a unit of mass of substance

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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 0 o C to 0 o C (l fus = 3.3x10 3 J/kg)

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SOLUTION

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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 100 o c to 100 o c? (l vap = 2.3x10 6 J/kg)

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SOLUTION

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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

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Do practice problems Assignment- latent heat problems

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