Presentation on theme: "Heat Transfer. Heat transfer Everything is made of molecules. When molecules gain energy they move faster and create more heat. (The faster the molecules."— Presentation transcript:
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.
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.