Filling small compressed air bottle with a big one

[khoopes01]

How can I figure the pressure in a 80 cubic inch tank at 0 psi being refilled
with a 8000 cubic inch tank with a pressure of 3600 psi?

 

[brewnog]

- The total system volume before and after filling stays the same
- The total mass of gas before and after filling stays the same
- The pressures in the two vessels will equalise

Does this help?