Yup... Both...tried it with my Class after reading James & the Giant Peach...even fresh vs. salt water...floated
Yes
Cold water.
Yes, as hot water is less dense than cold water so it will float on top of cold water. Over time the temperatures will equalise due to natural conduction and convection.
because hot water evaperates
They can float in hot. Like if you boil eggs, before you set the pot, water, and eggs on the stove, you see that they don't float until the water gets warm.
The density of cold water is greater than hot water so there will be more substances that will float in it.
The difference in water density (hot-cold) is very small, compared to the difference in density between water of any temperature, and your body. That is, even hot water is more dense that we are, so we still float.
Flour to cold water will just float on top, hot water to flour will cook the flour.
Cold will sink to the bottom. Hot water will rise to the top.
In hot water the molecules vibrate faster than cold, resulting in the same number of molecules taking up a larger space. This means that hot water is less dense than cold water, and thus floats above the cold water.
a steel ball bearing will drop faster in warm water then cold water, a beach ball will float better in cold water because cold water is more dense.
An egg will sink in water but will float in salt water. An egg will sink faster in hot water than it will in cold water.