change of air pressure with temperature

[lvkb]

I am designing a sealed box girder that is to be submerged under the sea once the box has been sealed. When the box has been submerged the trapped air reduces in temperature by about 10-15 degrees. How will this affect the air pressure within the box?

Thanks

 

[quark]

Use gas law to calculate the new pressure. At constant volume, absolute pressure is proportional to the absolute temperature. So, P1/T1 = P2/T2 or P2 = P1T2/T1.