Final answer:
Convection currents are responsible for heat transfer within a fluid, driven by differences in density due to temperature changes.
Explanation:
Heat transfer within a fluid takes place by convection currents. Convection is the transfer of heat by the movement of a fluid due to differences in density caused by temperature variances. This type of heat transfer is exemplified by convection currents in liquids and gases.
Learn more about heat transfer mechanisms here:
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