What are the four ways that heat energy is transferred?
Conduction, convection, radiation and evaporation.
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What is conduction?
Conduction occurs mainly in solids and is particularly fast in metals because their delocalised electrons quickly transfer kintetic energy along the metal.
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What is convection?
Convection currents occur in liquids and gases because their particles move faster when they are hot. These faster moving particles push each other apart, causing the fluid to expand (not the particles), become less dense and rise.
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What is radiation?
Radiation is the transfer of heat by electromagnetic waves and will occur through anything transparent to infr-red, including a vacuum. Black and dark surfaces both absorb and radiate heat well, while shiny and light surfaces tend to reflect it.
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What is evaporation?
Evaporation transfers heat from a liquid, storing it in the gas produced. Faster particles escape the liquid to become a gas, leaving the slower particles behind, reducing the temperature of the liquid.
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Other cards in this set
Card 2
Front
What is conduction?
Back
Conduction occurs mainly in solids and is particularly fast in metals because their delocalised electrons quickly transfer kintetic energy along the metal.
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