Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules.

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Presentation transcript:

Heat Transfer

Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules move the hotter they are) Melting Evaporation Condensation Freezing liquidSolidGas Molecules move very slowly! They are close together. Molecules move faster and are more spread apart. Molecules move very fast! They are very spread apart.

HeatIs the transfer of thermal energy from a hotter object to a cooler one until both objects are the same temperature. (You can not transfer cold or give someone cold) heat transfer video clip

3 ways that heat is transferred within the atmosphere Radiation Conduction Convection

Radiation What creates electromagnetic waves? Video clip 1 video clip 2 The direct transfer of energy by infrared electromagnetic Waves. Sun, fire, light bulbs

Conduction conduction video clip 1conduction video clip 1 The direct transfer of heat from one substance to another substance that is touching. That’s Hot Ironing Clothes Stepping on hot sand.

demo of conduction flame heating moleculesflame heating molecules

Convection convection video clipconvection video clip Heat video clips\Convection 2.asfHeat video clips\Convection 2.asf The transfer of heat by movement of a fluid (liquids and gases). OVEN Dryer Heating a room. Water boiling. Blow Drying your Hair.

Heating the troposphere Radiation, conduction and convection work together to heat the troposphere. Radiation- heats the Earth Conduction- Air near earth’s surface is warmed Convection- the warm air molecules rise and transfer heat to the cooler air molecules. Eventually these molecules cool and sink back down to earth. This creates Convection Currents.

Radiation Radiation, Convection and Conduction work together to heat the troposphere. review of all 3 types Conduction Convection Current

Review Heat transfer from a hotter object to a cooler object until both objects are the same temperature. 3 types of heat transfer Radiation – electromagnetic waves Conduction – touching Convection- through a fluid (liquid or gas) All 3 work together to heat the troposphere but Convection causes most of the heating.