Why Does Hot Air Rise And Cold Air Sink
Camila Farah
Very often cold air is denser than hot air so it sinks but that is because of.
Hot air is more dense than cold air. That means for the same volume of air hot air has fewer molecules and so it weighs less. Because of this the molecules in hot air tend to be further apart on average giving hot air a lower density. You ask why a column of hot air as in a chimney rises given that denser cold air is above it pushing down.
The molecules in hot air are moving faster than the molecules in cold air. The sun warms the surface of the earth and by conduction and convection some of that heat is transferred to the air which is closest to the ground. It rises because denser cold air around the bottom of the chimney is under higher pressure than the cold air at the top of the chimney. But this is only true in a gravitational field where there is a distinction.
Cold air is more dense than hot air. It causes convection currents because there is hot air and cold air the hot air will will rise and the cold air will sink. The extra pressure due to a chimney height of cold air is pushing it down. This is the principle in hot air balloons as the air in the balloon is lighter as it is hotter than the air around it meaning it will rise.
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See answer carissatrussell21 is waiting for your help. Denser air sinks replacing less dense air. Hotter fluids are less dense and rise. Why does hot air rise and cold air sink.
Cold air has more kinetic energy than hot air. As hot air cools it sinks back to the surface of the earth where it gets warmed by the ocean only to rise again. What the observation that hot air rises and cold air sinks is really saying is that denser air will sink and less dense air will rise. This is called a convection current.
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