Why do boats float?

Answer

A boat floats because the weight of the water it displaces is less than the weight of the boat itself. When an object is placed in a fluid in gravity, both the fluid and the object are pulled downward, but because the object is displacing the fluid, they are, essentially, competing for the lower position. If the object has more density than the fluid, it will be able to push it out of the way and will sink to the bottom. If not, it will only push its own weight of fluid out of the way, and the rest will float above the surface.

While boats often carry, or are made of, materials denser than water, they are also made with very large empty spaces inside. It is this empty space—filled with air, which is much less dense than water—that allows boats to float. Even though the materials that compose the boat are denser than water, by including the empty spaces, its overall density is much less. This is the same reason that a helium balloon floats in air, despite the fact that rubber is much heavier than air.

This principle for why things float is known as Archimedes principle, named after a famous scholar in ancient Greece.

Q&A Related to "Why do boats float?"
weight of the boat pushes the boat down and the water pushes it up. there is no air inside at all. well there is but that isn't the reason why it floats SOMEPERSON DID WRITE THAT
http://wiki.answers.com/Q/Why+do+pennies+in+an+alu...
The principle of Archimedes. The story goes that the king was sure his goldsmith had stiffed him with the making of a crown. He gave the goldsmith 1kg of gold and got a 1kg crown,
http://answers.yahoo.com/question/index?qid=200702...
An object in a fluid experiences an upward force equal to the weight of
http://www.chacha.com/question/how-do-boats-float%...
The United States Coast Guard requires that every closed compartment on any recreational boat with a gasoline engine must have ventilation. For spaces that can't ventilate directly
http://www.ehow.com/info_12027137_boats-need-blowe...
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