## How does a submarine withstand pressure?

Most submarines have two hulls, one inside the other, to help them survive. The outer hull is waterproof, while the inner one (called the pressure hull) is much stronger and resistant to immense water pressure. The strongest submarines have hulls made from tough steel or titanium.

Why the pressure on the submarine is less at the same depth?

So as the submarine dives deeper, the internal pressure (thankfully) stays the same… but the walls actually get thinner! The decrease in pressure occurs simply because as you go higher there is less air above you pushing down on you.

### How does pressure vary with depth?

Pressure increases with ocean depth. You don’t feel it because the fluids in your body are pushing outward with the same force. The deeper you go under the sea, the greater the pressure of the water pushing down on you. For every 33 feet (10.06 meters) you go down, the pressure increases by one atmosphere .

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How do submarines not get crushed under pressure?

Air (or gas) is very compressible, which means as pressure increases, its volume decreases greatly. Because submarines are made of metal, and metal can only withstand a certain amount of pressure before buckling or collapsing, the strength of the metal and the design of the sub determines its ultimate depth limit.

## Why are fish not crushed by pressure?

Under pressure Fish living closer to the surface of the ocean may have a swim bladder – that’s a large organ with air in it, which helps them float up or sink down in the water. Deep sea fish don’t have these air sacs in their bodies, which means they don’t get crushed.

Why does buoyant force act upward on an object submerged in water?

The buoyancy force is caused by the pressure exerted by the fluid in which an object is immersed. The buoyancy force always points upwards because the pressure of a fluid increases with depth.

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### How do you find the pressure acting on an object?

Pressure and force are related, and so you can calculate one if you know the other by using the physics equation, P = F/A. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2.

Why does pressure only depend on depth?

The deeper an object is placed in a fluid, the more pressure it experiences, because of the weight of the fluid above it. The more dense the fluid above it, the more pressure is exerted on the object that is submerged, aswell.

## What does water pressure depend on?

Pressure within a liquid depends only on the density of the liquid, the acceleration due to gravity, and the depth within the liquid. The pressure exerted by such a static liquid increases linearly with increasing depth.