why does salt water have a higher gravity then fresh water?
457644
It does indeed have a higher specific gravity than fresh water.\n\nPure water has a specific gravity of 1000 kilograms per cubic meter\n\nSea water (in general) has a higher specific gravity, on average it is around 1026 kilograms per cubic meter
126230
Adding salt to water makes the water denser and as you may know denser liquids have higher boiling points. So if you boiled two pots of water at the same temperature, one full salt water the other not, it would take longer for the salt water to boil.
894124
because of osmosis.  If you have a semi-permeable membrane separating a low level of salt solution and a high level of salt solution water will always travel toward the side with a higher concentration until it reaches equilibrium (the concentration is the same on both sides).  this is the case with bacteria or any other cell.  the cell membrane is semi-permeable.  If the bacteria lands on something that is very salty or very sugary the water will move from the inside of the cell to the outside of the cell to try to reach equilibrium.  The cell will shrivel and die because the water will be leaving it.  There are very few bacteria that can withstand this.  (of course there are some that can, there is ALWAYS an exception in biology)
810676
Salinity is measures as the amount of salt content in water in ppt (parts per thousand).\nThe amount of salinity depends on the source of water that feeds water into the sea. At the sea bed there is sand, rocks and sediments which contribute to the salt content in the sea. If there are many fresh water rivers opening into the sea with continuous supply the salinity will be low. Also if there is continuous supply of melting snow (this happens near the poles), content of salt will be low. \nHowever, if there is not much of fresh water flowing into the sea, the salinity will be high. Also, if the rate of evaporation is high, salinity will be high (this happens in tropical regions) because water evaporates leaving behind salts.\n\nThe Dead Sea has the highest salinity in the world. In fact the density of water is so high due to salt content that humans can actually float on the water. This is because Dead Sea is completely land-locked and has no source to supply fresh water.
602519
Salt or Sodium Chloride is highly soluble in water.  Salt is naturally occurring and large bodies of water that cover vast numbers of square kilometers come in contact with salt.  Over time it dissolves causing the water to be high in TDS or total dissolved solids such as NA CL.  When the water from oceans evaporates, the salt drops out of solution which increase the salinity of the remaining water.   The evaporated water returns to earth as fresh water which flows back into the oceans and the cycle continues.   Large Salt caverns are ancient spaces that have not been exposed to water for millions of years.
12598
Because the water collects minerals from the floor of the ocean and so on and it isn't circulated or "refreshed" as a freshwater lake would be.  For instance, the Great Lakes are freshwater because they constantly drain out into the oceans.  The water is replenished all the time, not just sitting in one spot.  It doesn't give them time to collect the minerals to get salty.  If a lake, such as the Great Salt Lake in Utah, doesn't have this circulation (not sure what the scientific word is for it, but there is one), a place to drain so the water can be replenished, it becomes salty because it absorbs the minerals.
581795
The highest temperature water in liquid form can reach is the boiling point.  At this point the water will change from a liquid phase to a gas.  For pure water, this initial temperature is 100 deg Celcius.  For salt water, the  water will reach about 100.5 deg before turning into a gas.  Once it becomes a gas it usually escapes direct contact from the heat source and cools and condenses back into a liquid form that is suspended in the air in the form of tiny droplets (this is the steam that you see).  Since any salt will remain behind as the liquid boils into a gas, the gaseous water from both sources will condense back into the steam that you see at 100 degrees.  So I guess you could say that the initial temperature of boiling water from salt water is slightly higher but once it becomes the white misty steam that you see, the two are basically the same temperature.
657044
It is not a ocean or sea, which are salted.\n\nA lake is non salted water, but the word fresh might be miss leading. Lake Superior's "fresh" water that is not so fresh, but not salted.
874952
Saltwater is isotonic to a cell assuming that it has a balanced osmolarity for the particular cell.  Fresh water has essentially no ionic component, and as such will cause the cell to take up water in an attempt to balance the gradient.
303761
Did you ever wonder why the oceans are filled with salt water instead of fresh? Just where did the salt come from? And is it the same salt you find on a dining room table? Most of the salt in the oceans came from land. Over millions of years, rain, rivers, and streams have washed over rocks containing the compound sodium chloride (NaCl), and carried it into the sea. You may know sodium chloride by its common name: table salt! Some of the salt in the oceans comes from undersea volcanoes and hydrothermal vents. When water evaporates from the surface of the ocean, the salt is left behind. After millions of years, the oceans have developed a noticeably salty taste.\n\nDifferent bodies of water have different amounts of salt mixed in, or different salinities. Salinity is expressed by the amount of salt found in 1,000 grams of water. Therefore, if we have 1 gram of salt and 1,000 grams of water, the salinity is 1 part per thousand, or 1 ppt.\n\nThe average ocean salinity is 35 ppt. This number varies between about 32 and 37 ppt. Rainfall, evaporation, river runoff, and ice formation cause the variations. For example, the Black Sea is so diluted by river runoff, its average salinity is only 16 ppt.\n\nFreshwater salinity is usually less than 0.5 ppt. Water between 0.5 ppt and 17 ppt is called brackish. Estuaries (where fresh river water meets salty ocean water) are examples of brackish waters.\n\nMost marine creatures keep the salinity inside their bodies at about the same concentration as the water outside their bodies because water likes a balance. If an animal that usually lives in salt water were placed in fresh water, the fresh water would flow into the animal through its skin. If a fresh water animal found itself in the salty ocean, the water inside of it would rush out. The process by which water flows through a semi-permeable membrane (a material that lets only some things pass through it) such as the animal's skin from an area of high concentration (lots of water, little salt) to an area of low concentration (little water, lots of salt) is called osmosis.\n\nThis is also why humans (and nearly all mammals) cannot drink salt water. When you take in those extra salts, your body will need to expel them as quickly as possible. Your kidneys will try to flush the salts out of your body in urine, and in the process pump out more water than you are taking in. Soon you'll be dehydrated and your cells and organs will not be able to function properly.
28439
The mineral content of the Dead Sea is significantly different from that of ocean water, consisting of approximately 53% magnesium chloride, 37% potassium chloride and 8% sodium chloride (table salt) with the remainder comprised of various trace elements.\n\nThe concentration of SO4 ions is very low, and the bromine ions concentration is the highest of all waters on Earth. Chlorides neutralize most of the calcium ions in the Dead Sea and its surroundings. While in other seas NaCl is 97%, in the Dead Sea the quantity of the NaCl is only 12-18 percent. The water temperature goes from 19 °C in February to 31 °C in August.\n\nThe water of the Dead Sea contains 21 minerals including magnesium, calcium, bromine and potassium. Twelve of these are found in no other sea or ocean, and some are recognized for imparting a relaxed feeling, nourishing the skin, activating the circulatory system and for easing rheumatic discomfort and metabolic disorders. Comparison between the chemical composition of the Dead Sea to other lakes and oceans show that the salt's concentration in the Dead Sea is 31.5% (the salinity fluctuates somewhat). Because of its unusually high concentration of salt, anyone can float in the Dead Sea easily because of natural buoyancy. In this the Dead Sea is similar to the Great Salt Lake in Utah, in the United States.
190514
Density of matter is the reason anything floats.  Any object that displaces its own weight will float. Salt water raises the density of water. Consequently any object will float easier in salt water because it only has to displace little weight compared to non salt water
847236
It is because of all the minerals dissolved and very small washed into it, from rivers, that have erode on the land.\n\nIt is a certain mix of minerals that makes it salty, but the dead sea is an example of where mineral are washed in, but dont run out to anywhere is, so it just gets saltier.
820799
Weight. "An object goes as deep as the amount of mass it can move upwards", so that's why... the more salt, the heavier the water and less the egg can descend.
826959
The basic answer to that is:\nAs water falls on land and runs into the oceans it picks up minerals.\nWhen it gets to the ocean the minerals get mixed into the ocean water.\nSunlight causes the water to evaporate but leaves the minerals behind.\nThe water then falls on land again repeating the process.\nEventually the salt content in the oceans built up to where it is today. And continues to build up.
433818
Water provides more force than air because it is\ndenser and thus has more mass:\n\nF = ma \n\nd = m / volume
289316
They are often different due to the different water temperatures.  The total amount of dissolved salt in water decreases with temperature.