What's the Volume of Air in Dan's Diving Bell at 10m Depth?

[lillybelle14]

Homework Statement

At the surface, where the temperature is 27 °C, the volume of air in Dan’s diving bell is 2 metres cubed. When he descends to a depth of 10 m the pressure doubles and the temperature drops to 7 °C. What volume of air does Dan have in his diving bell now?

Homework Equations

P1 x V1/T1 = P2 x V2/T2

The Attempt at a Solution

P1= ? P2= ?
V1= 2 metres cubed V2= ?
T1= 27 °C (300 Kelvin) T2= 7 °C (280 Kelvin)


Im having trouble finding out P1 and therefore I can't find out P2 and V2!
Please help me.
Thanks

 

[Doc Al]

Im having trouble finding out P1 and therefore I can't find out P2 and V2!

You don't need the actual pressure, just the fact that it doubles. Express P2 in terms of P1.

(Although: What's the pressure at the surface of the water?)