The density of bubble gum is about 960 kg/m3 . You blow a6.30-gram wad of gum into a bubble with a measured diameter of 9.90cm . Assume that all of the gum is in the skin of the bubble.

a)What is the thickness of the bubble? Hint: Thinkabout spreading the bubble into a flat sheet. The surface area of asphere is 4π r^2

What had been the thickness of the bubble when the growingbubble was only 1/4 of its final diameter?