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Warm air is lighter than cold air because cold air is denser, by dense I mean the particles in cold air are more packed together than it is in warm air. Therefore cold air is heavier which is why warm/hot air always floats above cold air (same thing with hot/warm and cold water). That is why warm/hot air is lighter than cold air.

That's the reason why a hot air balloon only goes up when there's something producing hot air (like fire for example), and the only reason it goes back down is if you put out the fire. Remember this only happens because Hot water/air is less dense than cold air which makes it lighter.

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Q: Why is warm air lighter than cold air?
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Related questions

Are warm air masses lighter than cold air masses?

Warm air masses are lighter than cold air masses because the molecules of cold air move slower than the warm air's molecules.


Is cold air lighter than warm air?

no


What is less dense warm air or cold air?

Warm air is less dense (lighter) than cold air..that is why warm air rises and cold air settles


Why doesn't a warm air mass under a cold air mass at a warm front?

Warm air is lighter than cold air, that means that warm air will rise and the cold air will sink.


Are cold air masses lighter the warm air masses or the same?

cold fronts are heavier than warm fronts


What are the characteristics of warm and cold air for weather?

Warm air is lighter and therefore rises. Cold air holds more water and is heavier. Cold air sinks lower than warm air.


Is warm air dense?

No, warm air is lighter than cold air because hot air rises and cold air stays in the same place.


A warm air mass is pushed upward because why?

Warm air is lighter than cold air. So you'll always get warm air on top of cold air when they meet.


Why does cold air always chase warm air?

This due to Warm air being lighter than cold air. Warm air rises. This causes a suction and colder air comes in from the sides..


Is cold air denser than normal air?

Yes, cold air does have a higher density than warm air. For example, if you turn on the fireplace, all of the warm air rises to the ceiling. On the floor, the air is cooler.


Why does warm air slide over cold air at worm fronts?

Warm air is lighter then cold air. So the cold air sinks and the warm air raise.


Why warm air rises and cool air sinks.?

hot air is lighter than cold air so, it gose up