Thermal energy moves in three main ways — Science, 14–17 years
Conduction, convection and radiation explain how warmth travels through objects, fluids and empty space.
Heat has routes
Thermal energy moves from a warmer place to a cooler one. In conduction, touching particles pass energy along; in convection, moving fluid carries it; in radiation, electromagnetic waves carry it. These routes can happen together.
Why separate the routes?
People wanted to explain why a metal spoon, boiling water and sunlight warm things differently. Naming the routes links observations to predictions: a metal usually conducts well, moving water convects, and sunlight crosses empty space by radiation.
Why a pan handle gets hot
A hob heats the metal base of a pan. Vibrating metal particles pass energy into nearby particles, so heat conducts through the pan and along its handle. The air above also warms and rises by convection, while the hot pan emits some infrared radiation.
Cold is not a substance
It feels as if cold travels from ice into your hand, because your hand becomes colder. More precisely, thermal energy leaves your hand and enters the ice. The sensation is real, but “cold flowing in” reverses the direction of energy transfer.
Keeping buildings comfortable
Buildings use all three routes of heat transfer. Insulation slows conduction, trapped air reduces convection, and shiny surfaces reflect radiation. No material stops heat perfectly, so designers combine methods rather than relying on one magical barrier.
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