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Why do some things float on water?

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Objects float because of density. All objects are made up of atoms, and atoms have mass. In order to find the density of an object, divide the mass by volume. If the object is less dense the fluid it is in, then it will float.
Because they are less dense than the water.
We call the amount of mass in a given volume of space the density. For instance, we could measure the mass of some fresh water in a container. We would then divide the mass of the water by the volume of the container to find the density. However, if we filled the same container with salt water, it would have more mass because the ocean water has the mass of pure water plus the mass of the salt. Since there is more mass in the same volume, ocean water has a greater density then fresh water.
For something to float, it must have a density that is less than in what it is floating in.
It may seem odd that an enormous ship can float when steel is denser than water. However, if you look at the entire ship you see that there are many places filled with things less dense than water, like air. This means that the density of the entire ship is less dense than that of the water it floats in.

To understand why things less dense then water float in water, go to the question "What is the buoyancy principle?" in the Related Questions section below.
Thanks for the feedback!

Why do some things float in salt water but not in fresh water?

Because salt water can carry more objects than fresh water because the salt in the water makes the water heavier, and because fresh water has nothing in it so it's less heavie

Why things float on water?

Objects will float on water because they aren't as dense as the water itself. A ship will float because there are a lot of compartments filled with air, which is not as dense

Why are there things that don't float on water?

  An object's density is related to its weight and size. If the density is less than that of water, it will float on the water. If it is greater than that of water, it

How do things sink or float in water?

A very interesting phenomenon.  When a body is put on the surface of water, first its bottom surface gets a little bit immersed. So an amount of water vacates from its place

How does a heavy thing float on water?

A property called buoyancy. A heavy object, a ship for example, displaces more water than it weighs. If the ship weighed more than the water it displaces the ship would sink.

Which things floats in water?

Any substance with a density less than water will float in it. Anything with a specific gravity less than 1 will float.
In Science

Do things float better in salt water or fresh water?

Things can float better in salt water, due to density. For a visual experience, try getting 2 cups, fill both with tap water, and put salt in one cup, then mix it in. Get 2 eg
In Science

Does things made of ceramic float or sink in water?

depends on what it is...and how much water...but ceramic is pretty much like the equivalent of glass when it comes to floating in water...probably more heavier though Yes and
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Can light things float on water?

If it has enough surface area such as a leaf or bigger yes so long as it lands on the water in such a way it traps a little air under it, note..even concrete can float, many s