If you've ever gone swimming in the ocean, you may have noticed that it's a lot easier to float in salt water than in fresh water (like a pool or lake). Why?
Earlier, in "Sinking Soda?", you saw that the density of an object determines whether it floats or sinks. But it turns out that the density of the liquid matters, too. Obviously, salt water has lots of salt (or sodium chloride) dissolved in it. In fact, sea water is usually about 3.5% salt. This means that every gallon of water has about 15 teaspoons of salt dissolved in it. This makes sea water heavier than fresh water. In other words, sea water is more dense.
Fill two drinking glasses with about 1 cup of water (make sure the glasses are big enough first!). Add one teaspoon of salt to one of the glasses and stir until it dissolves. This makes the water about as salty as seawater. Take two eggs, and carefully place one in each glass. What do you see?
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment