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Conduction is heat transfer by bringing two systems at different temperatures into physical contact. The molecules of the warmer system bang against the molecules of the cooler system more energetically than vice versa, consequently the energy of the warmer system gradually transfers to the cooler system until they come into thermal equilibrium (same temperature). You get conduction through a system if the edges of the system are at different temperatures.

Convection occurs when flow of a fluid at a higher temperature into a fluid of lower temperature. This can either be "forced convection" - requiring a pump or fan, or "natural convection". Where the movement is due to buoyancy effects due to the difference in density between warmer and cooler fluids; as air or liquid heats up, it expands and becomes less dense, which causes it to rise. It is replaced by cooler air or liquid, which is then heated as well.This is why we heat liquids from underneath, and why your house will be warmer if your heater is on the bottom floor.

Radiation is the flow of energy as waves through space (and, in some cases, matter). Some examples of radiation are visible light, radio waves, and radiant heat. That's how the heat of the sun gets to us.

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7y ago
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15y ago

The 3 means of transmitting heat energy form one place to another.

1) Conduction - if you heat one end of an iron bar in a fire the heat will travel up the bar to the cold end by thermal conduction.

2) Convection - hot air rising from a hot central heating radiator is distributing heat by convection.

3) Radiation - when you stand in front of a hot electric fire or at some distance from a bonfire, you can feel the fire's heat on your body, this is radiated heat (a form of long wavelength light) and is how the Sun warms the Earth.

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11y ago

Convection, conduction, and radiation are all methods of heat transfer.

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15y ago

Modes of heat transfer

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Q: What are examples of conduction convection and radiation?
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