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 seawater
A motley collection of boneworms (w/ Video)
Nov 10, 2009 |
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(PhysOrg.com) -- It sounds like a classic horror story -- eyeless, mouthless worms lurk in the dark, settling onto dead animals and sending out green "roots" to devour their bones. In fact, such worms do exist ...
Oases for Life on the Mid-Caymen Rise
Space & Earth / Earth Sciences
Oct 21, 2009 |
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A team of oceanographers and astrobiologists is currently exploring one of the deepest points in the Caribbean Sea. Follow their blog as they search for life in this extreme seafloor environment.
Digging deeper below Antarctica's Lake Vida
Space & Earth / Earth Sciences
Sep 14, 2009 |
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(PhysOrg.com) -- Antarctica's Lake Vida, a geologic curiosity that is essentially an ice bottle of brine, is home to some of the oldest and coldest living organisms on Earth. Perpetually covered by more than 60 feet of ice, ...
Iron isotopes as a tool in oceanography
Space & Earth / Earth Sciences
Jul 31, 2009 |
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New research involving scientists from the National Oceanography Centre, Southampton (NOCS) highlights the potential utility of iron isotopes for addressing important questions in ocean science. The findings are published ...
Scientists refine, redefine seawater equation
Space & Earth / Earth Sciences
Jul 31, 2009 |
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This summer, one of the world's leading ocean science bodies, the United Nations Educational, Scientific and Cultural Organization's (UNESCO's) and Intergovernmental Oceanographic Commission (IOC) adopted ...
Science adopts a new definition of seawater
Space & Earth / Earth Sciences
Jul 20, 2009 |
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The world's peak ocean science body has adopted a new definition of seawater developed by Australian, German and US scientists to make climate projections more accurate.
Science adopts a new definition of seawater
Space & Earth / Earth Sciences
Jul 07, 2009 |
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The world's peak ocean science body has adopted a new definition of seawater developed by Australian, German and US scientists to make climate projections more accurate.
Is the Pacific Ocean's chemistry killing sea life?
Jun 21, 2009 |
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The collapse began rather unspectacularly. In 2005, when most of the millions of Pacific oysters in this tree-lined estuary failed to reproduce, Washington's shellfish growers largely shrugged it off.
Non-toxic hull coating resists barnacles, may save ship owners millions
May 28, 2009 |
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North Carolina State University engineers have created a non-toxic "wrinkled" coating for use on ship hulls that resisted buildup of troublesome barnacles during 18 months of seawater tests, a finding that could ultimately ...
Coral reefs may start dissolving when atmospheric CO2 doubles
Space & Earth / Earth Sciences
Mar 09, 2009 |
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Rising carbon dioxide in the atmosphere and the resulting effects on ocean water are making it increasingly difficult for coral reefs to grow, say scientists. A study to be published online March 13, 2009 in ...
Vibrio bacteria found in Norwegian seafood and seawater
Feb 24, 2009 |
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(PhysOrg.com) -- While working on her doctorate, Anette Bauer Ellingsen discovered potentially disease-causing vibrios (Vibrio cholerae, V. parahaemolyticus and V. vulnificus) in Norwegian seafood and inshore ...
Exploring hidden life’s abundance
Space & Earth / Earth Sciences
Feb 12, 2009 |
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(PhysOrg.com) -- Two miles below the surface of the Sargasso Sea lies a depression in the Earth’s crust filled with sediment and, scientists believe, teeming with life — exotic, microscopic, and very likely ...
Genetic adaptations are key to microbe's survival in challenging environment
Biology /
Feb 06, 2009 |
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The research focused on the bacterium Nautilia profundicola, a microbe that survives near deep-sea hydrothermal vents. Photosynthesis cannot occur in this dark environment, where hot, toxic fluids oozing from below the se ...
New equation of state of seawater
Feb 05, 2009 |
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Seawater is a complex, dynamic mixture of dissolved minerals, salts, and organic materials that despite scientists best efforts, presents difficulties in measuring its potential to contain and disperse energy. Like the water ...
Signs point to sponges as earliest animal life
Biology /
Feb 04, 2009 |
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(PhysOrg.com) -- Even Charles Darwin was puzzled by the apparently sudden appearance in the fossil record of a great variety of multicellular creatures — a rapid blossoming known as the Cambrian explosion. ...
