Question

. A spread out sheet of Aluminium foil floats on the surface of water but when we compress the same sheet and roll into a ball, it sinks to the bottom underwater. Give Reason I will mark you the brainliest

Answer 1

Explanation:

You have to compress an aluminum foil ball very tight to get the air out of it. We had to use a hammer. Perhaps if instead of “wadding it up” we had carefully folded it, we wouldn’t have had to use a hammer. When air is trapped in the ball it makes the density of the ball less. The bouyant force of the water pushes up on the ball and the density of the ball has to be more than the density of the water for it to sink. That means your aluminum foil ball has to be a VERY small volume w/ little to no air trapped inside. If there is much air at all, then it behaves like a boat