Any with a density less than water, or, like a metal ship, an object with a shape which makes its volume greater than the volume of water that it displaces and is sealed so that water will not flow into it.
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Often the element helium (atomic symbol: He) often makes objects float, most commonly balloons.
objects that are less dense float to the top.
No, objects tend to float higher in salt water compared to fresh water. This is because salt water is denser than fresh water, providing more buoyant force to floating objects.
Anything that has a density that is lower than water will float. The lower something's density is, the more buoyancy it will have.
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