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Submarines are able to rise and sink because of their denists in the these tanks called ballast tanks which keeps both subamarineand ships afloat. When a submarine wants to sink they fill the ballast tanks with a bunch of water or air unitt they start sinking. When they get to their desired depth they release some water or air until they are level.
The pressure in the submarine keeps the same on the inside because they have valves that can help decrease or increases the pressure along with electrical heating so the pressure doens't change as much on the inside. Pascal's Law is present he becase of the pressure changing on the outside the pressure on the inside doesn't change. If the pressure were to increase a lot inside because of like a leak the submarine could implode just like the OceanGAte submarine
When a submarine fuel get transformed into mechanical energy to power the engine and some of that energy also goes into eectrica energy for heating and the electronics.
Nuclear Submarines are run by nuclear reactors. Thereatcorc split atoms whihc realse energy as heat and thn thatheat is used to create hihg pressure steam and that s fed into the proppeller and it moves forwards/backwards and it heats the subamrine and electronics are powered by it
Nucler fission is whats used in the engines to keep the submarine powered. Nuclear fission is where the nuclear reactor splits an atom whihc releases energy. Most subamarines use uranium atoms whihc produce a lot of energy because they are radioactive. The energy the goes into every system, but mainly the propeller because it is really heavy and hard to move the whole submarine so it needs a lot of energy