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Unformatted text preview: 2. The reason that density of scandium is twice as calcium even though they have the same mass is because the volume of calcium is twice as scandium. 3. Because of its gas bladder, fish can able to swim. The gas bladder is a gas that initiates gases (oxygen) to increase fish’s volume and buoyancy. Buoyancy is the upward power on fish in water. Fish floats by raising gas in gas bladder and sinks by decreasing volume of gas bladder. 4. The submarine is controlled to float or sink by satisfying the ballast tanks with both air and water to change the mass and density. They controlled the submarine to float or sink regulate the water and air in the ballast tanks....
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This document was uploaded on 03/01/2010.
- Spring '09