Why do some objects sink while others float?

Answer

Whether an object sinks or floats depends on its density and the density of the liquid into which it is placed. If the object has a greater density than the liquid, it sinks. If it has less density, the object floats.

Scientists call the ability of an object to float its buoyancy. The key factor that determines an object's buoyancy is whether its molecules are densely packed together or are loosely packed. An object that has a high density, such as a lead, is going to sink because it has higher density than water, while an object with loosely packed molecules, such as wood, is able to float.

Q&A Related to "Why do some objects sink while others float?"
It all depends on the density of the object. If an object was less dense than water, then it will float. If an object is more dense than water, then it will sink.
http://wiki.answers.com/Q/Why_do_some_objects_floa...
The level of air (gas) in your poop is what makes it either float or
http://www.chacha.com/question/why-do-some-poops-s...
Some people just have natural boiency. Also, fat floats. So overweight people are more likely to float. Also the more oxygen you have in your lungs, the more likely you'll float. (
http://answers.yahoo.com/question/index?qid=201207...
Hi Theresa, It depends on the density of the object. For instance, not all objects sink, many float and that is because the density of the object is less then that of water. A good
http://en.allexperts.com/q/Science-Kids-3250/Weigh...
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Objects comprised of material that is denser than water tend to sink; objects with a lighter density tend to float. Since air is lighter than water, hollow objects ...
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