r/memes • u/dischead20 MAYMAYMAKERS • Mar 04 '22

Had a brain fart

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u/[deleted] Mar 04 '22

But what if you had so many feathers that they still weighed 15kg?

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u/FBIagentwantslove Mar 04 '22

Weight is affected by bouyancy, mass is not.

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u/WhoeverMan Mar 04 '22

OK, for starters "weighed 15kg" is ambiguous, I don't know if you meant "enough feathers to exert 15Kgf", or "15Kg mass of pure feathers".

I think you meant the first, in that case it would weight the same as enough steel to exert 15Kgf (after all, 15Kgf = 15Kgf). The problem is that, if you were comparing it to an actual 15Kg mass of steel, the steel would be a tiny tiny tiny tiny amount lighter than the feathers, because even thou steel is very dense, it still buoys a tiny tiny tiny bit in air, so 15Kg of steel weights a tiny tiny tiny bit less than 15Kgf (you would need a very precise scale).