Do Now # 4 Do you think a bottle of water sitting on the desk has thermal energy? Explain. 2. Do you think a bottle of water sitting on the desk has kinetic energy? Explain.
Do Now # 5 (page 32) What direction is heat transferred? How is heat transferred between molecules? Explain which would keep you warmer on a cold night: A lighter weight sleeping bag that is tight around your body A heavy weight sleeping bag that is extra wide?
Heat Transfer
Vocabulary Words Add the following words to your Vocabulary section in the back of your Science notebook. Heat transfer Radiation Conduction Convection
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 liquid Solid Gas Molecules move very slowly! Molecules move faster. Molecules move very fast!
(You can not transfer cold or give someone cold) Heat transfer Is 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
The first method of heat transfer How does heat energy get from the Sun to the Earth? RADIATION ?
The direct transfer of energy by infrared electromagnetic Waves. Radiation What creates electromagnetic waves? Video clip 1 video clip 2 Eureka start at 2:30 The direct transfer of energy by infrared electromagnetic Waves. Sun, fire, light bulbs
Pair Share Partner A: What is radiation and where does it come from. Partner B: What are three different things that create electromagnetic radiation?
Conduction conduction video clip 1 Eureka The direct transfer of heat from one substance to another substance that is touching. Objects have to touch!!! Ironing Clothes Stepping on hot sand. That’s Hot
Conduction When you heat a metal strip at one end, the heat travels to the other end. As you heat the metal, the particles vibrate, these vibrations make the adjacent particles vibrate, and so on and so on, the vibrations are passed along the metal and so is the heat. We call this?
Example of Conduction
Pair Share: Partner A: Using the picture on the right explain the conduction process Pair Share: Partner B: Explain how the picture on the left is conducting heat.
The transfer of heat by movement of a fluid (liquids and gases). Convection convection video clip Convection 2 Convection- Eureka The transfer of heat by movement of a fluid (liquids and gases). Cooking peas in water Blow Drying your Hair. Dryer OVEN
Water movement Cools at the surface Convection current Hot water rises Cooler water sinks
Conduction, Convection and Radiation
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, Convection and Conduction work together to heat the troposphere. review of all 3 types Radiation Convection Current Conduction
Review Heat transfer from a hotter object to a cooler object until both objects are the same temperature. 3 types of heat transfer review, review 2 Music Review 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.