Asked by omafr
definitions of the words: Conduction, Convection, Radiation
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- Conduction — transfer of heat through a material by direct contact, via collisions between particles and (in metals) movement of free electrons. Example: one end of a metal rod getting hot when the other end is placed in a flame.
- Convection — transfer of heat by the bulk movement of a fluid (liquid or gas), where warmer, less dense portions rise and cooler, denser portions sink; can be natural (buoyancy-driven) or forced (fan/pump-driven). Example: boiling water circulating in a pot.
- Radiation — transfer of energy by electromagnetic waves (infrared, visible, etc.); does not require a medium and can occur through a vacuum. Example: the Sun warming the Earth.
- Convection — transfer of heat by the bulk movement of a fluid (liquid or gas), where warmer, less dense portions rise and cooler, denser portions sink; can be natural (buoyancy-driven) or forced (fan/pump-driven). Example: boiling water circulating in a pot.
- Radiation — transfer of energy by electromagnetic waves (infrared, visible, etc.); does not require a medium and can occur through a vacuum. Example: the Sun warming the Earth.
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