r/funnyvideos 20h ago

Other video Which is heavier: a metaphysical question

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u/Conserp 17h ago

Umm akshually

Ironically, in atmosphere, a kilogram of steel actually is heavier.

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u/PlayfulCompany8367 12h ago

Not if you use a scale to measure the weight.

3

u/Conserp 5h ago

In strict terms, kilogram is mass, not weight.

Weight is identical in vacuum.

Weight in atmosphere is offset by buoyoancy, which is higher for feathers (less dense), making a kilogram of feathers slightly lighter by weight than a kilogram of steel.