SPECIFIC HEAT CAPACITY Heat SPECIFIC HEAT CAPACITY C

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SPECIFIC HEAT CAPACITY : Heat

SPECIFIC HEAT CAPACITY : Heat

SPECIFIC HEAT CAPACITY (C) • The quantity of heat required to raise the temperature

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

EXAMPLE • When 4. 0 kg of water is cooled from 40 o. C

EXAMPLE • When 4. 0 kg of water is cooled from 40 o. C to 5 o. C. How much heat energy is lost?

SOLUTION

SOLUTION

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

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

SPECIFIC LATENT HEAT • Is the quantity of heat energy required to change the

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

SPECIFIC LATENT HEAT OF FUSION • The quantity of heat energy released when 1

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 (lfus= 3. 3 x 103 J/kg)

SOLUTION

SOLUTION

SPECIFIC LATENT HEAT OF VAPORIZATION • is the quantity of heat energy needed to

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 oc to steam @ 100 oc? (lvap= 2. 3 x 106 J/kg)

SOLUTION

SOLUTION

LATENT HEAT APPLICATIONS • Picnic coolers- ice in a cooler will absorb some heat

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

• Do practice problems • Assignment- latent heat problems

• Do practice problems • Assignment- latent heat problems

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