I Tank and hydrostatic pressure

1. May 20, 2017

jean

Hey,

Let's imagine I have a tank, filled with air at atmospheric pressure. This tank have a closing/opening valve.
I dive this tank at 100m under water and opened ce valve, my filling speed will be sqrt( 2*g*h) with h=100m.
Now, if i want to dive the tank (with a volume X) continuously at a velocity Vd. How can i calculate, how much time it will take to fill it ? Asa water enter the tank, the pressure won't be Patm anymore..
Thanks !

2. May 20, 2017

Staff: Mentor

Use the ideal gas law for the air pressure in the tank.

By the way, is this a homework problem?

3. May 20, 2017

jean

Yes i can use P1 V1 = P2 V2 (but i guess the air goes away in bubble and not compressed right ?) and no it's not a homework. The answer may be: it will take an infinite time to fill the tank because while we go in depth, the difference of pressure btw the outside and the inside will decrease and so the filling speed... The volume filled will be like an exponential with an horizontal asymptote.. What do you think? Thanks