Answer Posted / shekhar

The popular belief that buoyancy or the upthrust force only acts in case of a fall is false. Let's say you are underwater in a submarine and you step out of it into the water will you not get pushed up to the surface(if you don't apply any external force)? Every fluid has an upthrust force magnitude of which depends upon the density of the fluid. Now coming to the point. The atmosphere of earth is a fluid and therefore it offers an upthrust. The upthrust of course is more on the thing that occupies more space. In this case 1kg of cotton will obviously occupy more space than 1kg of iron and hence the upthrust on cotton will be more than the upthrust on 1kg of iron making the 1kg of cotton lighter than 1kg of iron. However in case of a vaccume both will weigh the same.

P.S - Rate this a "No" only if you have a counter valid explanation not because you think you're right.

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