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Which is lighter: hot air or cold air?

Gabry Ponte Asked by irishtomboy 7 months ago, 5 answers.

ok I guess hot water is lighter than cold water but what about hot air and cold air?
we can breathe cold air but not hot air so how does that work? is it because hot air is heavier than cold air? and if you put the covers over your head you can't stay under for long because it gets too hot to breathe

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PWT's rock!!! Answered by plainwhitets on Dec 29, 2007, 11:26PM
| 570 answers.

Hot air rises, therefore is lighter.

Clearing the Gene Pool Answered by bimjob on Dec 29, 2007, 11:35PM
| 1322 answers.

Most things expand when heated, and if a given volume expands it's density will decrease (I.e. it will get lighter.)

Your head under the covers 'problem' is due to a build-up of CO2. (CO2 is also the reason that you can't hold your breath longer. When you HAVE to take a gulp of fresh air, your lungs have only extracted a small part of the oxygen.)

Gabry Ponte Answered by irishtomboy on Dec 30, 2007, 12:02AM
| 260 answers.

thank you

Answered by fau on Jan 08, 2008, 10:45PM

hot air rises thats one reason in a fire thet tell you to stay low the other reason is cause of the smoke

Gabry Ponte Answered by irishtomboy on Jan 09, 2008, 09:29PM
| 260 answers.

oh ok thanx

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