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A man is sitting on a boat which is floating in a pond. If the man drinks some water from the pond, What happens to the level of water?

According to me, the level of the water in the pond should decrease. However, when I tried to perform it on a mini scale (I really did not have any means to get the correct answer) by putting a spoonful of water in the toy boat instead of a man drinking water (well, I hope both the actions are equivalent), I found that the level of water remains same. How?

Related: but doesn't answer my question here.

Community
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InquisitiveMind
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2 Answers2

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The water level should stay exactly the same, by Archimedes' law: The boat will displace a volume of water that has the same weight as the boat. If you remove some water and put it in the boat, the boat will displace an additional amount of water that's exactly the same as the one you have removed.

Pirx
  • 3,803
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When the man drinks some water from the pond, his weight increases and therefore the boat will sink further. The further sinking of the boat will displace the same volume of water in the pond as drunk by man. Therefore, there will be no change in the level of water in the pond.

InquisitiveMind
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