Why does convection occur?
Heat causes fluids to become less dense; so warmer fluids rise above cooler fluids, transferring energy.
Heat increases the kinetic energy of molecules; the molecules have greater energy when they collide, increasing energy transfer.
Heat is released during some types of reactions and absorbed during others, transferring energy to the system or surroundings.
Heat flows through the air as electromagnetic radiation, transferring energy without matter.
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