• ### Does an object's total weight change in water?

I'm trying to understand Archimede's principal fully, but I got stuck on an issue. Let's say a 100 litre water tank weights 10kg, and 100 litres of water obviously weights 100kg. So if you put the tank on a set of scales, and filled up the tank, the scales would read 110kg. (100kg water + 10kg tank). Now, if you put a 1kg stone in... show more
I'm trying to understand Archimede's principal fully, but I got stuck on an issue. Let's say a 100 litre water tank weights 10kg, and 100 litres of water obviously weights 100kg. So if you put the tank on a set of scales, and filled up the tank, the scales would read 110kg. (100kg water + 10kg tank). Now, if you put a 1kg stone in the water tank too, would the scales read 111kg, or would something different happen? I know that the stone in the water would be a given amount lighter than 1kg (proportional to the amount of water it displaces), but would the total weight of the stone show up on the scales beneath the tank to form 111kg, or would it be 111kg minus the weight of the displaced water?
5 answers · Physics · 8 years ago