When an item is submerged underwater, I believe that pressure from the surrounding water is equal in pressure around the item except from beneath, is this correct?
The pressure exerted by a liquid increases linearly with depth, i.e. the deeper you go the more pressure is exerted. However, this pressure is exerted uniformly at a certain 'level' in all directions. Therefore, there is a greater force (note force not pressure) pushing a submerged object upwards than downwards; i.e. there is a net force upwards. This is buoyancy.When an item is submerged underwater, I believe that pressure from the surrounding water is equal in pressure around the item except from beneath, is this correct?
If you might indulge me,? , if I wanted to pump air too, say a depth of eight feet, and I only was equipped with something with a low psi, (very minimal psi), how would it be easier to have the air break the barrier of pressure/force to escape its chamber?
Would I have a better chance at trying to get the low pressure air out by pointing it upwards or down, (at that eight foot level).
Before I forget there is a sort of check valve on it that won't let water through its outlet, but air can move freely throught it.