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Thermal Energy and Heat

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Presentation on theme: "Thermal Energy and Heat"— Presentation transcript:

1 Thermal Energy and Heat

2 Thermal energy is the sum of the potential energy and the kinetic energy possessed by the molecules of an object. A hot object has more thermal energy than a cold object because the molecules are moving faster. A substance in its liquid state at its boiling point has less thermal energy (per kilogram) than when it is a gas at the same temperature.

3 Review relationship between Temperature and Heat:
Thermal energy that is transferred!! Measure of the average Kinetic energy of the molecules in a substance! Is mass dependent!! Is not mass dependent!! Cannot be measured directly!! Only by the changes in temperature they cause!! Can be measured directly!! With a thermometer!! Measured in Joules(J) Measured in oC, oF, or K Defined…. Defined…. Does it depend on Mass? Does it depend on Mass? Can you measure it? Can you measure it? Units??? Units???

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5 Heat - The flow of thermal energy from one object to another.
Thermal energy transferred from cup to hand Heat - The flow of thermal energy from one object to another. Heat always flows from warmer to cooler objects. Thermal energy transferred from hand to ice cube

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7 3 Ways to Transfer Heat Conduction---direct contact.
Convection—transfer of heat in liquids and gases!! Radiation—transfer through empty space!!

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10 Discuss Heat Transfer Mechanisms!!!
RADIATION CONVECTION RADIATION CONDUCTION CONVECTION CONDUCTION

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13 MEASURING TEMPERATURE
SI UNITS Kelvin/Celcius K = °C + 273 e.g. 10°C = °C = K – 273 e.g. 10K = 283 K -263°C Alternate unit (the “US” units!) Fahrenheit °C = 5(°F – 32) 9 e.g. 75°F = 24 °C

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