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How do you calculate an object will float in water?

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The Archimedes principle states that:

The amount of force pushing a body up in a fluid equals to the weight of the fluid that such body displaces.

This seems complicated, but it's actually simple:

Suppose you have a ball of volume equal to 1L. Say that ball weights 0,5kg. However, 1L of water weights 1kg. So the ball floats on water.


Another way of saying it:

If an object has lower density then water, it floats.

or

If an object is lighter then an equivalent (same volume) mass of water, it floats.

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