Why the pressure of the water is so more in the depth of the Ocean? OR Why there is so much high pressure in the Ocean water compared to small water bodies?
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Pressure is a force applied over an area.
Weight is a force caused by the gravitational pull on an object. So pressure is just a weight divided by an area.
When you are underwater, gravity is pulling the water above you downwards. The pressure is just the weight of this column of water above you divided by the area of the column.
For example, in the USA we use pounds per square inch (psi) for our typical unit of pressure. This means if at the bottom of the ocean the pressure is 1000 psi then if you removed a square column of water with dimensions of 1 inch by 1 inch from where you are to the surface, and then weighed that water, it would weigh 1000 pounds. Ok, that isn’t quite right because you also have the atmosphere weighing down on you. We need to take a 1″x1″ column of air up to the edge of the atmosphere and weigh it. If we did, we’d find that that column of air weighed about 14.7 pounds. Therefore that water column really only weighed 1000-14.7=985.3 lbs.
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