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Saltwater

Sea water is water from a sea or ocean. On average, sea water in the world's oceans has a salinity of ~3.5%. This means that for every 1 litre (1000 mL) of sea water there are 35 grams of salts (mostly, but not entirely, sodium chloride) dissolved in it. This can be expressed as 0. more...

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06M NaCl or 0.06 mol/L.

Although a vast majority of sea water is found in oceans with salinity around the 3.5 %, sea water is not uniformly saline throughout the world. The planet's freshest (least saline) sea water are in the eastern parts of Gulf of Finland and in the northern end of Gulf of Bothnia, both part of the Baltic Sea. The most saline open sea is the Red Sea, where high temperatures and confined circulation result in high rates of surface evaporation and there is little fresh inflow from rivers. The salinity in isolated seas and salt-water lakes (for example, the Dead Sea) can be considerably greater.

The density of sea water is between 1020 and 1030 kg/m3. Seawater pH is limited to the range 7.5 to 8.4.

Geochemical Explanations

Scientific theories behind the origins of sea salt started with Sir Edmond Halley in 1715, who proposed that salt and other minerals were carried into the sea by rivers, having been leached out of the ground by rainfall runoff. Upon reaching the ocean, these salts would be retained and concentrated as the process of evaporation (see Hydrologic cycle) removed the water. Halley noted that of the small number of lakes in the world without ocean outlets (such as the Dead Sea and the Caspian Sea), most have high salt content. Halley termed this process "continental weathering".

Halley's theory is partly correct. In addition, sodium was leached out of the ocean floor when the oceans first formed. The presence of the other dominant element of salt, chloride, results from "outgassing" of chloride (as hydrochloric acid) with other gases from Earth's interior via volcanos and hydrothermal vents. The sodium and chloride subsequently became the most abundant constituents of sea salt.

Ocean salinity has been stable for millions of years, most likely as a consequence of a chemical/tectonic system which recycles the salt. Since the ocean's creation, sodium is no longer leached out of the ocean floor, but instead is captured in sedimentary layers covering the bed of the ocean. One theory is that plate tectonics result in salt being forced under the continental land masses, where it is again slowly leached to the surface.

Potability

Even on a ship or island in the middle of the ocean, there can be a "shortage of water" meaning, of course, a shortage of fresh water. This is described most famously by a line from Samuel Taylor Coleridge's The Rime of the Ancient Mariner:

"Water, water, every where
Nor any drop to drink."

Seawater can be turned into drinkable (potable) water by one of a number of desalination processes. Otherwise, it should not be drunk because of its high dissolved mineral content. In the long run, more water must be expended to eliminate these minerals (through excretion in urine) than is gained from drinking the seawater itself.

Read more at Wikipedia.org


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Prices current as of last update, 04/13/21 11:41pm.

See also...
Big Game Lures, Saltwater
Fishing Line, Saltwater
Reels, Saltwater
Rod & Reel Combos, Saltwater
Rods, Saltwater
Saltwater Lures, Saltwater
Videos, Books, Saltwater

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