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Certain:

An object heavier than water usually sinks to the bottom.

If you gently place it on the surface however, it might float on the surface due to surface tension.

This can obviously not be attained with something like a brick.

You need something small like a needle to get to see this effect.

Not certain:

My guess is that this has something to do with hydrogen bridge bonds. (Something similar to a chemical bond but far weaker.)

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11y ago
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Q: What is surface tension as a physical property of water?
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