How much salt is in the ocean?
Seawater contains about 35 grams of salt per kilogram of water, says Dean Roemmich, an oceanographer at Scripps Institution of Oceanography at the University of California, San Diego. That means a 2 liter (.5 gallon) bottle filled with seawater would contain about 5 tablespoons of salt.
If all the oceans were to dry up, the world's ocean floors would be covered in a 12-story-tall pile of salt. Floating devices that measure salt in the seas show that the Atlantic is our saltiest ocean, and polar waters have the least salt.
Question from Louis L., New York, New York
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