Heat Transfer: Conduction, Convection, and Radiation

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Conduction is the direct heat transfer from one substance to another.

Ice melting in your hand.

Convection is the direct heat transfer from a fluid. Air is a fluid.

The Greenhouse Effect. Signup and view all the answers

Transfer of heat energy through empty space. Signup and view all the answers

The Sun. Signup and view all the answers

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Conduction involves direct heat transfer between substances in contact.
Examples include heat conduction through metal or cooking food in a pan.
Ice melting in a hand showcases conduction; thermal energy moves from hand to ice.

Convection refers to heat transfer through fluids (liquids or gases) due to motion.
Involves the circulation of fluid as warmer, less dense regions rise and cooler, denser regions sink.
The Greenhouse Effect exemplifies convection; heat is trapped in the Earth's atmosphere.

Radiation is heat transfer that occurs through empty space, without needing a medium.
It includes energy emitted in the form of electromagnetic waves.
The Sun represents radiation as it emits heat and light to the Earth across the vacuum of space.