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The Transfer of Heat
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Energy Is the ability to make things move or change; all matter is made up of tiny particles or molecules
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Molecules in Solids
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Thermal Energy Is the energy of these particles moving; we feel this as heat Molecules are slower when cool. Molecules move faster when warm.
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What happens when particles or molecules are heated/cooled?
When molecules are heated they move faster and expand (spread apart); heated air or water becomes less dense (lighter) when heated When molecules become cooler they slow down and tend to compact (get closer), become more dense (heavier)
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Molecules in Liquids
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Water Molecules: Evaporation & Condensation
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Molecules Expand & Contract
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More about Matter
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Heat Transfer in Matter
The movement of heat; heat always flows from a warmer object to a cooler one There are three ways heat transfer can happen: Conduction, Convection, and Radiation
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Conduction Is the transfer of heat (thermal energy) between things that are touching
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Conductors Materials through which heat can move easily; metals like iron, copper, and steel
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Insulators Material that heat does not move through easily; plastic, rubber, wood, leather, glass, and ceramic Ceramic Tiles
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Conduction
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Convection Is the transfer of heat by the movement of liquids or gases
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Convection
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Convection
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Radiation Is the transfer of heat energy by electromagnetic waves
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Radiation
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3 Types of Heat Transfer
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3 Types of Heat Transfer
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