# An air bubble

#### PRINCESS NOOR

Dear Sirs,

i need your help in this question, truthly i can't solve it. so kindly asking you to send me an answer with proper explanation if possible.

the question is:
an air bubble has a volume of 2.5 cm3 when released at a depth of 40m in water. What will its volume be when it reches the surface? Assume its temperature is constant, and the atmospheric pressure=10m of water

thank you

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#### DaveC426913

Gold Member
(This is elementary to a scuba diver.)

Google 'Boyle's Law'. It describes the very simple inverse relationship between volume and pressure in a gas.
Try this: (http://www.grc.nasa.gov/WWW/K-12/airplane/aboyle.html)

The only other thing you need to know is what the pressure at 40m is. Google 'pressure depth'

Try this:(http://www.americandivecenter.com/deep/preview/pd02.htm [Broken])

See what you can do with that, and if you get stuck, come back here.

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