why things dont sink in salt water?
923875
Salt water is denser than fresh water.
575768
No oceans are made of freshwater, unless I am mistaken. They are all made of salt water.
1043479
...because their density is less than water density (1000 Kg/m^3).\n\nIf the density of an object is less than the density of the water, it floats on the surface of the water. If the density of the object is equal to the density of the water, the object floats anywhere inside the water. If the density of the object is more than the density of the water, the object sinks to the bottom.
427084
The density of water is greatly affected by salinity, or the salt concentration.  When salts are dissolved into pure water, the density of water increases because the salts have a greater density than the water; thus freshwater floats on salt water.  This is also why your ability to float differs between a swimming pool and an ocean.
108792
They are made of wood, which floats because it has a lower density than water.  If you made a ship out of solid gold, it would sink, for example.
142072
Salt water works better because it's a better conductor of electricity as opposed to just tap water.  In salt water, you have a solution of both Cl- and Na+ floating about creating a means of transferring electricity (electolytes).  So, instead of a saltbridge to provide the transfer of ions, all the ions needed are right there, which will quickly drain the battery.  Think of it as a short circuit - you have a large current because the path of resistance from the cathode to the anode is nothing.  Plus, there's plenty of ions to provide that means of conduction.
676507
because sea water has a salt concentration in it, and it is corrosive, similar to an acid but not as destructive. and saltwater will kill plant life harming the surrounding enviroment. they do but they also have salt water filters on the firboats to help bring the salt concentration down.
49972
As water flows in rivers, it picks up small amounts of mineral salts from the rocks and soil of the river beds. This very-slightly salty water flows into the oceans and seas. The water in the oceans only leaves by evaporating (and the freezing of polar ice), but the salt remains dissolved in the ocean - it does not evaporate. So the remaining water gets saltier and saltier as time passes.
224956
For any kind of electrochemistry to occur, there should be electrolytes present in the fluid to transfer charges.  This is why salt water is more corrosive.
39301
Think of it this way:  If an object weighs more than it would if it was made of water, it will sink.  If an object weighs less that it would if it was made of water it will float.\n\nA coin is made of solid metal which makes it denser than water, therefore heavier.  It will sink.  A ship is made of metal also, but NOT solid metal.  It also consists of other materials but mainly air (inside the ship).  This means it's lighter than water, which is why it will float.
112480
Hello, Every subamarine contains ballast tanks that when the needs to sink  it takes in water, due to the pressure and weight the submarine sinks and goes underwater and is propelled through propellars. When it needs to rise to suface, it lets the water out slowly and air comes and fills its ballest tanks and the submarine comes to surface. \n\nThats' it works, more info, check the web
226032
There is theory that says perhaps the fresh water aquifers under that area of the ocean rupture into the salt water, making the water less boyant.  That would sink ships loaded with cargo or near their max weight limit.  Yet it does not account for lost planes.  So who knows?
1057120
If I remember right, the crystalline structure of the salt breaks down, and the Na and Cl ions move freely in the water, dissolving into the water.\nSince the salt breaks down into free ions, that explains why salt water is such a good electrical conductor.
255563
Dead things often end up on their backs because that is the equilibrium position with their center of gravity lowest to the ground. Dead fish float upside down because that places their center of gravity nearest the surface. Either way, the energy of the system is minimized. SUVs easily tip over for the same reason - too high a center of gravity
987768
Not every solid sinks.... it depnds on the density of the solids.
235582
The salt comes from the deposition a long period of time from  rivers and streams. Earth has salt naturally with in soils and such. Think of it this way, salt Was being deposited at a faster rate than it was being removed over millions of years giving salt water. The oceans are NOT getting saltier, it is in a state of equalibrium currently with the rate of removal over deposition.
317174
Dear Friend,\n\nSalt in the ocean comes from the land. The elements that make up salts, such as chlorine and sodium, started out in rocks. Water and acids eroded the rocks, and rivers carried the elements into the sea. The oceans usually contain 35 parts of salts for every 1000 parts of sea water. This is lower in some places where there is a lot of fresh water coming into the ocean. It is higher where the Sun is very strong and evaporates more of the water. When all the water is gone, the salts are left behind as solid, white crystals.\n\nThe right amount of salt is a very important part of our diet. In ancient times, salt was worth its weight in gold. People used it to flavor and preserve their food. Without salt, the food would spoil. For this reason, salt became a symbol of purity. Some sacrifices in the Old Testament included salt (Leviticus 2:13; Ezekiel 43:24). Jesus called faithful people "the salt of the earth," and the apostle Paul said that our speech should be "seasoned with salt" (Colossians 4:6).