Heat and Heat Transfer HeatTemperatureConductionConvectionRadiation.

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Heat and Heat Transfer Heat Temperature Conduction Convection Radiation

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Transcript of Heat and Heat Transfer HeatTemperatureConductionConvectionRadiation.

Page 1: Heat and Heat Transfer HeatTemperatureConductionConvectionRadiation.

Heat and Heat Transfer

HeatTemperatureConductionConvectionRadiation

Page 2: Heat and Heat Transfer HeatTemperatureConductionConvectionRadiation.

Temperature•Hotness and coldness of a body•Related to the kinetic energy of the molecules

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Heat

• Energy being transferred from one body to another

• Internal Energy • Sum of potential and kinetic energies

inside matter

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Heat Transfer

• Heat energy flows from bodies with higher temperature to bodies with lower temperature

• Heat transfer occurs until both bodies have the same temperature • Thermal equilibrium

Page 5: Heat and Heat Transfer HeatTemperatureConductionConvectionRadiation.

Heating does not always increase temperature.

•Change in the arrangement of particles•Change of phase•Potential energy

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Conduction

• Direct transfer of energy through vibration of atoms

• Happens in solids• Mechanism

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Conductor

• Material that allows heat or energy to pass through it (or conduct.)

• Metals: very good conductors• Good heat conductors are also good electrical

conductors.

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Insulator

• Material that ________ heat to flow through• inhibit or does not allow • Conduct slowly

• Examples:• Plastic• Wood• Rubber

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Convection

• Heat transfer by movement of particles or molecules

• Fluids (liquids and Gases)• Mechanism

• Convection current• Examples

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Thermal Radiation

• Heat transfer without use of a medium

• Electromagnetic radiation• Infra-red radiation• Microwave

• Mechanism• Emission of electromagnetic

radiation

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Surfaces and Radiation

• Black Surface• Good radiator, good absorber

• White surface• (Good reflector) bad absorber,

bad radiator• Silver Surface

• Very good reflector, bad absorber

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Thermos Bottle or Vacuum Flask

                   

                                   

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