Question
Why does a boat with a hole in the bottom would eventually sink?

Answer

A boat with a hole at the bottom allows water to enter it, thus increasing its weight and hence it sinks. As water starts entering the boat through the hole, the boat starts to get heavier, so it starts to sink, trying to displace more water. But the water keeps coming as the hydrostatic pressure at the hole is always higher than the atmospheric pressure pushing down on the surface of the water in the boat.

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