Question

if you fill your lungs with 4 qt of air at a depth of 66 ft, how many quarts of air will you need to exhale during your ascents to still have 4 qt of air in your lungs when you reach the surface

Answer 1

The question comes down to how many quarts V2 of air at atmospheric pressure P2 equals the amount of gas in 4 quarts at the pressure P1 66 feet under the sea.

P V = n R T, but T is the same temperature

P1 V1 = P2 V2

V2 = (P1/P2) V1

P2 = 1 atm

P1 = 1 atm + pressure of 66 feet of water, m g h, [roughly 2 atm, but check that]

I'm supposed to stop short of giving you the answer, so....

Answer 2

i agree ....with ur infor .. :)