Which description defines convection?

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Multiple Choice

Which description defines convection?

Convection is heat transfer through a fluid by the fluid’s own movement. When a liquid or gas is heated, the warmer parts become less dense and rise, while the cooler parts are denser and sink, creating a circulating flow that moves heat around. The description in the option matches this idea: in a heated liquid or gas, the warmer portion rises and the cooler portions sink. This is different from radiation, which transfers heat by electromagnetic waves through space, and from conduction, which is heat transfer by direct contact between substances. The notion of heat energy stored permanently in a material isn’t about transferring heat at all, so it doesn’t describe convection.

Convection is heat transfer through a fluid by the fluid’s own movement. When a liquid or gas is heated, the warmer parts become less dense and rise, while the cooler parts are denser and sink, creating a circulating flow that moves heat around. The description in the option matches this idea: in a heated liquid or gas, the warmer portion rises and the cooler portions sink. This is different from radiation, which transfers heat by electromagnetic waves through space, and from conduction, which is heat transfer by direct contact between substances. The notion of heat energy stored permanently in a material isn’t about transferring heat at all, so it doesn’t describe convection.

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