Seawater
hideSeawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5%. This means that every 1 kg of seawater has approximately 35 grams of dissolved salts (mostly, but not entirely, the ions of sodium chloride: Na+, Cl-). The average density of seawater at the surface of the ocean is 1.025 g/ml; seawater is denser than freshwater (which reaches a maximum density of 1.000 g/ml at a temperature of 4°C) because of the added mass of the salts. The freezing point of sea water decreases with increasing salinity and is about -2°C (28.4°F) at 35 gram per liter.
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News tagged with ocean water
How much water does the ocean have?
Space & Earth / Earth Sciences
Nov 12, 2009 |
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The calculation of variations in the sea level is relatively simple. It is by far more complicated to then determine the change in the water mass. A team of geodesists and oceanographers from the University of Bonn, as well ...
Earth's early ocean cooled more than a billion years earlier than thought (w/ Video)
Space & Earth / Earth Sciences
Nov 11, 2009 |
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(PhysOrg.com) -- The scalding-hot sea that supposedly covered the early Earth may in fact never have existed, according to a new study by Stanford University researchers who analyzed isotope ratios in 3.4 ...
Autosub6000 dives to depth of 3.5 miles
Space & Earth / Earth Sciences
Oct 28, 2009 |
5 / 5 (3) |
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The United Kingdom's deepest diving Autonomous Underwater Vehicle (AUV), Autosub6000, has been put through its paces during an extremely successful engineering trials cruise on the RRS Discovery, 27 September ...
Peering under the ice of a collapsing polar coast
Space & Earth / Earth Sciences
Oct 07, 2009 |
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Starting this month, a giant NASA DC-8 aircraft loaded with geophysical instruments and scientists will buzz at low level over the coasts of West Antarctica, where ice sheets are collapsing at a pace far beyond ...
Dangerous staph germs found at West Coast beaches
Sep 12, 2009 |
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(AP) -- Dangerous staph bacteria have been found in sand and water for the first time at five public beaches along the coast of Washington, and scientists think the state is not the only one with this problem.
Human Impacts and Environmental Factors Are Changing the Northwest Atlantic Ecosystem
Aug 31, 2009 |
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(PhysOrg.com) -- Fish in U.S. waters from Cape Hatteras to the Canadian border have moved away from their traditional, long-time habitats over the past four decades because of fundamental changes in the regional ...
Oxidized lava may help explain Earth's evolution
Space & Earth / Earth Sciences
Jul 30, 2009 |
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(AP) -- Material from volcanoes where the Earth's plates squeeze together is more oxidized than in regions where the seafloor splits apart, a finding that helps shed light on some of the basic processes in ...
150 years later, Darwin vindicated... by jellyfish: Researchers link tiny sea creatures to large-scale ocean mixing
Space & Earth / Earth Sciences
Jul 29, 2009 |
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(PhysOrg.com) -- Creatures large and small may play an important role in the stirring of ocean waters, according to a study released Wednesday that confirms a theory advanced by Charles Darwin.
Wetlands likely source of methane from ancient warming event
Space & Earth / Earth Sciences
Apr 23, 2009 |
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An expansion of wetlands and not a large-scale melting of frozen methane deposits is the likely cause of a spike in atmospheric methane gas that took place some 11,600 years ago, according to an international ...
DNA of uncultured organisms sequenced using novel single-cell approach
Apr 22, 2009 |
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Scientists from the U.S. Department of Energy (DOE) Joint Genome Institute (JGI) and the Bigelow Laboratory for Ocean Sciences have assembled high quality, contamination-free draft genomes of uncultured biodegrading microorganisms ...
Catastrophic sea levels 'distinct possibility' this century: study
Space & Earth / Earth Sciences
Apr 15, 2009 |
4.4 / 5 (89) |
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A breakthrough study of fluctuations in sea levels the last time Earth was between ice ages, as it is now, shows that oceans rose some three meters in only decades due to collapsing ice sheets.
Study: Public trust doctrine could aid management of US oceans
Apr 09, 2009 |
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Since Congress lifted a moratorium on offshore drilling last year, federal lawmakers have grappled with the issue of how best to regulate U.S. ocean waters to allow oil, wave and wind energy development, while sustainably ...
Subterranean oceans on Saturn's moon Titan
Space & Earth / Space Exploration
Apr 06, 2009 |
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(PhysOrg.com) -- Saturn's largest moon, Titan, may have a subterranean ocean of hydrocarbons and some topsy-turvy topography in which the summits of its mountains lie lower than its average surface elevation, ...
Study Finds 'Pre-Existing Condition' Fueled Killer Cyclone
Space & Earth / Earth Sciences
Feb 26, 2009 |
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(PhysOrg.com) -- A "pre-existing condition" in the North Indian Ocean stoked the sudden intensification of last year's Tropical Cyclone Nargis just before its devastating landfall in Burma, according to a ...
Ocean acidification could have broad effects on marine ecosystems
Dec 17, 2008 |
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Concern about increasing ocean acidification has often focused on its potential effects on coral reefs, but broader disruptions of biological processes in the oceans may be more significant, according to Donald Potts, a professor ...
