How does a fish manage to rise up and go down in water?
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How does a fish manage to rise up and go down in water?

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In order to rise up, air diffuse from the body of fish and flows into its bladder. As a result, the volume of the fish increases and so the upthrust increases. In order to come down, air diffuses from the bladder and the fish thus empties its bladder. As a result, the volume of the fish decreases and so the upthrust decreases.

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