# When does wet cloth weigh less than dry [closed]

What liquid should you use to wet a piece of cloth, so that weight of a wet cloth is less than weight of a dry cloth?

The only idea I have is that you should wet the cloth in sunflower oil and then immerse it into water. It won't sink, because the oil won't let the water to soak cloth, so the cloth will float. But it still has its weight (it' putting pressure on the water) and it weighs more because it has oil in it.

So I'm comletely stumped here.

I know, that this question was offered in the university course of molecular physics.

## closed as unclear what you're asking by John Rennie, Kyle Kanos, Cosmas Zachos, ZeroTheHero, sammy gerbilMay 25 '18 at 16:05

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• Seems to me that you're asking if you can add mass to something and make it weigh less than not adding mass, which doesn't make sense to me. – Kyle Kanos May 24 '18 at 17:21
• @Kyle Kanos - it makes sense sometimes. If you add some helium into balloon, it will have less weight because of buoyancy force. – Anna from Svetlogorsk May 24 '18 at 19:30
• operationally, that might be true but the definition of $W=mg$ shows it isn't . See physics.stackexchange.com/q/130541/25301 – Kyle Kanos May 24 '18 at 19:36
• @Kyle Kanos - we are talking about different weight here. I guess, in Englisg the weight I'm talking about is called "apparent weight" and it's defined as a force wich a body exerts on a support or a suspension due to Earth gravitation. – Anna from Svetlogorsk May 24 '18 at 19:58
• When you have a strong enough magnetic field underneath it. Water is paramagnetic. – Arvin Singh May 26 '18 at 14:53