The idea is to calculate the pressure difference ΔP between the outside and the inside. Multiply ΔP by the area to get the force.
One pascal = 1 N-m-2.
Pa= 100 kPa
= 100*103 Pa
Density of sea water
= 1025 kg-m-3
= 1025*9.81 N-m-3
= 10.055*103 N-m-3
At 115m deep, hydrostatic pressure
Ph= 115*10.055*103 Pa
= 1156.3*103 Pa
Net pressure difference
Area of window (diameter 300 cm ?)
Force on window
= 0.0707 m² *1056.3*103 Pa
= 74669 N
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