energy: conservation and transfer. heat the transfer of energy between objects that are at 2...
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Energy: Conservation and
Transfer
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Heat
• The transfer of energy between objects that are at 2 different temperatures
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Conduction
• Conduction is the transfer of heat by the collision of particles; the particles must touch in order to transfer heat. Metals are considered good conductors since they can speedily transfer heat. Stone is also a moderately good conductor, but wood, paper, air, and cloth are poor heat conductors.
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Convection
Transfer of heat from one place to another by the movement of fluids or gases
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Radiation
• The energy radiated by electromagnetic waves through empty space as a result of their temperature; heat travels outward from its source
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Transfer
• to convey or remove from one object, place, person, etc., to another
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Electromagnetic Waves
• Electromagnetic waves are formed when an electric field (shown as blue arrows) couples with a magnetic field (shown as red arrows).
• When you listen to the radio, watch TV, or cook dinner in a microwave oven, you are using electromagnetic waves.
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Thermal Energy
Thermal energy is the energy of a substance due to the movement of its atoms or molecules. More the molecules are moving about, the higher the temperature.
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Convection Cell
• Moving body of fluid due to the rise of heat and fall (gravity) of cool gases until the heat is no longer heated (Ex. Current/cycle)
• Convection cells are responsible for making macaroni rise and sink in a pot of boiling water. One of the forces that contributes to lava erupting from a volcano is convection.
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Insulator
• A material that does not conduct heat very well
• Ex: foam, paper, plastic, wood
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Conductor
• A material that gets hot and cools off very quickly
• Ex: metal, water