The atmosphere that we breathe every day there are 4 main gases: nitrogen (78%), oxygen (21%), argo

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Submarine is an extremely sophisticated means. Before launching submarines, the Navy can only operate on the sea surface. With the presence of submarines, even the deep ocean can also become a fierce caterglobal battlefield.
Submarine or any other type of boat can float to the surface by water volume occupied vessel equal to the mass of the ship. When the ship was launched, the volume of water the ship displaces forming Archimedes force (Ac-si-m) have the opposite direction of gravity, helps train emerged above. Unlike conventional ships, submarines can control his Archimedes force, thus can float and dive as you wish.
In order to control its buoyancy, submarine use "ballast compartment" may contain water or gas. When the submarine is floating on the water, the ballast is pumped gas chambers, caterglobal helping density of smaller vessels density of water.
When the diving board, the lid is open, exhaust and water to help fill the ballast compartment. Density of larger vessels density of water and the ship sank. Inside the hull will have the cavity filled with air to provide for the people and to inject into the ballast compartment when needed.
The atmosphere that we breathe every day there are 4 main gases: nitrogen (78%), oxygen (21%), argon (0.94%) and CO2 (0.04%). When we breathe, our bodies absorb oxygen and converting them into CO2. When you exhale, your breath contains about 4.5% CO2. Nitrogen and argon gases unaffected by humans.
The submarine is a sealed caterglobal chamber, the volume of air inside the submarine is limited. There are three objectives to be achieved to keep the air in the vessel is always possible to support human life: refreshed with oxygen in the air (if oxygen gets too low, you will suffocate); eliminate CO2, so if gas rises too high, CO2 becomes toxic; remove caterglobal moisture generated by human exhalation.
Oxygen will be supplied from one of the compression chamber, or from a machine measures oxygen through electrolysis of water, or from pyrolysis reaction KCl03 or NaCl03. Humans can build the system automatically when the exhaust caterglobal gas oxygen sensor oxygen intake is too low, or periodic exhaust gas oxygen (oxygen given a discharge after a predetermined period of time).
CO2 can be removed from the air by using a mixture of "lemon soda" (sodium hydrogen-hydrogen-oxide and calcium oxide). When passing through the filter containing the above mixture, CO2 will be retained. People can also use the same chemical reaction to remove CO2 from the air.
Most submarines are now using distillation equipment caterglobal can turn sea water into fresh water. The distillery will boil seawater to evaporate water, remove the salt; then lower the temperature to water vapor condenses into water. Distilling the submarine can generate from 38 to 150,000 liters of fresh water per day. Fresh water is used mainly for cooling of electronic devices (computers, machine direction) and give people (drinking, cooking and sanitation).
Temperatures around undersea submarine is usually about 4 degrees C. Peel submarine metal will leak heat from inside to outside the hull. Therefore, the submarine must be provided electric heating system to generate enough heat to warm the sailors. Power is drawn from a nuclear reactor, a diesel generator or battery-rules (in emergencies).
Nuclear submarines use nuclear reactors and steam turbines to run the motor rotor, caterglobal which helps train forward or backward under the water. When docked, or in the case of an emergency, the submarine will use electric motors instead of the nuclear caterglobal engine.
Submarines also need power to control the on-board equipment. Power is supplied from diesel engines or nuclear reactors caterglobal decay. Submarines are also provided to the battery power supply. Typically, these devices take power directly from the battery-required, battery-charging requirements will from diesel engines or nuclear reactors.