Yes it does in zero gravity! Not to mention as water vapor, or ice. And in a different atmosphere it most certainly could.

Water floats on oil.

No, it sinks.

Yes, there is a body of very salty water at the bottom of the Gulf of Mexico that looks like a beach with a shore where the less salty water floats on top of the more salty water.

Very vague question, but to answer, of course water floats. To float is to have enough buoyancy to displace enough of whatever it is you happen to be on, to stay on top. So water floats on sand, rock, or anything else that is more dense. If you're asking whether water floats in water, no. A good way to see how water reacts with water is to add some food coloring to a small amount of water, and then dump that into a lager amount of water.

1) we can only speak of floating if we can make a clear separation between what floats and the medium where it floats. In many cases, it is a solid floating in a liquid or a gas, but it could also be a ballon or a bubble, which are not solids. 2) if we had warmer coloured water put in a container of colder water, one will see it go upwards, but they would also quickly start to mix together, so I don't know if this really qualifies. 3) as long as there would not be some other reaction, water in liquid form would build bubbles which would float in another liquid, if this liquid is heavier than water (for instance mercury). It would also build bubbles in some particular conditions of low gravity (aboard a space station). 4) water in solid form usually floats on liquid water. However, we rather call it ice in that case. Moreover, a freezing or melting could take place at the surface of the ice. 5) Further information: - "Can Water Float on Water?" http://www.sciencebuddies.org/science-fair-projects/project_ideas/OceanSci_p002.shtml - "How to Make Water Float. And Deadly." http://singlenesia.com/news/2007/10/02/499/ - "Why Does Fresh Water Float?" http://www.learner.org/jnorth/tm/manatee/FreshWater.html 6) "When water in two beakers is exposed to a high voltage, a floating water bridge forms between the beakers" Source and further information: http://www.physorg.com/news110191847.html "The Floating Water Bridge - Startup & Expansion (real time)" http://www.youtube.com/watch?v=FhBn1ozht-E

If in a frozen state, water will float on itself. Water will also float on any liquid that has a higher density, for instance, chloroform.

Isn't that similar to asking if air floats? If so, does it?

Yes. Depending on what form it is in and what other substance/liquid it comes into contact with.

Clouds........

Yes, water floats. Even if you consider bodies of nothing but water, like lakes and oceans, water 'floats' within these bodies. This is because bodies of water, especially large bodies of water, are not homogenous (i.e. uniformly mixed) but are composed of layers which float upon each other due to differences in salinity, temperature, disolved solids, and so forth. If you've ever swam in the ocean and felt the water temperature change from warm on the top to cold when you dove down, this is a perfect example.

Yes, on something that has a higher density.

Different temperatures of water floats and some sink, depending on what it is in and with:-)

it floats inside itself all the questions on H2O today!

Only in water.

no, it blends

Depends on the air density and the gravitational force of any random molecular particle.

On the top of what?