the overall density goes up.
The density will rise and submerge the submarine.
The density will rise and submerge the submarine.
Increases
Submarines have variable density. When a submarine is in port, its overall density is less than that of water so some of it is above the surface of the water. They're made out of steel, which is more dense than water, but they're hollow; most of the volume of a submarine is air. To make a submarine able to dive, they pump water into tanks. By adjusting the amount of water, they can make the density equal to water's density, which allows the boat to stay at a certain depth without expending energy to hold it up.
What is the question. -That is just a convoluted ststement
Filling the ballast tanks with water increases the submarine's density. This will cause it to sink into the water. Blowing out the water with air reduces it and the sub will return to the surface.
During World War I, Imperial Germany utilized submarines to terrible effect in its attempt to achieve victory. In particular, it focused its submarine campaign against Great Britain, with the hope that it could starve the island-nation into surrender and thereby gain the upper hand in the overall conflict.
Nuclear submarines as an overall design do not have a patent, but many functioning systems within them do. For example, reactor type/model, engines, sonar, periscopes/optics, radio systems, etc., and even many systems that were originally developed and patented by John Phillip Holland remain key elements of modern submarines, even though their technology has evolved.
Water is denser than air. As the water is pumped out, air replaces the space that was occupied by the water. Therefore, the total density of the sub decreases. The above answer is correct. Here is a little more detail. As you may be aware density is a function of mass and of volume. It's mass per unit of volume. If you had a pan full of water and a similar pan which was empty, the water filled pan would weigh more, though the overall volume would be the same. Hence the density would be greater. When the submarine 'pumps out' the water it is replaced by air. Because air is less dense than water, it reduces the overall density of the vessel. Consider that the submarine is a vessel, as in a ship, and also a vessel, as in something that holds something else, like a cooking vessel. The submarine is a closed vessel; it has a fixed volume set by the hull. But by pumping water into or out of its internal tanks, it can change its total mass. If it pumps water in, it is increasing its total mass, and this will increase its density (as the volume stays the same). Pumping water out decreases the submarine's total mass, and its density will go down.
Compressed air is used to push the water out of the ballast tanks. This makes the submarine overall less dense than the surrounding seawater, and makes it rise to the surface. The same technique is used to change depth upwards, and can be stopped before the surface is reached.
Pakistan's population density is 214/km2.
Though Diesel-Electric boats are in fact much quieter on the battery than Nuclear Powered boats (the first thing taught in Sonar school), even with today's battery technology, DE submarines are limited in range, equipment, speed, maneuverability, and weapons they can carry. This in effect limits their overall usage as a weapons/intelligence/covert insertion/Naval escort platform. In the early '60's, there was a big debate over the cost of nuclear powered boats vs. conventional DE submarines, as the success of the USS Nautilus (SSN-571) led the Navy to push for more of its type. A tactical test pitted one NP boat against several DE submarines - in simulated attacks, all DE boats were discovered and sunk by the NP submarine. This is what led to the Navy's current doctrine of using only nuclear powered boats. One of the largest drawbacks to DE technology today is the major advancements in Anti-Submarine Warfare (ASW) technology, which has developed considerably over the years since WWII. Though the biggest threat to any submarine is still a submarine, patrol aircraft (fixed-wing and rotor) use sophisticated sonobuoys and dipping sonars that can direct surface and other air assets to the area to track and destroy a submarine. In such cases, the ability to go deep and rapidly egress the area is paramount, and the speeds/depths of modern NP submarines allows them to do that, where DE submarine technology is limited in that regard.