Science · 6 pages · 12 min
Why hot air rises in a room
Heated air expands, becomes less dense, and is buoyed up by the cooler air.
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From the opening
Hot air rises because heating it, at the same pressure, makes it expand and become less dense than the air around it. The cooler, heavier air pushes in underneath, and the light parcel is buoyed upward. The opening covers expansion lowers the density, cooler air supplies the push, and why a ceiling gets warm.
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Inside
- Expansion lowers the density
- Cooler air supplies the push
- Why a ceiling gets warm
- Heat can move without rising air
- Where the idea stops applying
- A distinction worth keeping
Sources
- Buoyancy of a warm air parcel
- Convection driven by heating from below