Solve the all parts of given question:
Question: The density of bubble gum is about 970 kg/m3 . You blow a 7.00-gram wad of gum into a bubble with a measured diameter of 9.50 cm. Assume that all of the gum is in the skin of the bubble.
Part I: What is the thickness of the bubble? Hint: Think about spreading the bubble into a flat sheet. The surface area of a sphere is 4pi*r2. Give your answer in mm.
Part II: What had been the thickness of the bubble when the growing bubble was only 1/3 of its final diameter? Give your answer in mm.
If possible just a brief explanation how you find the thickness of the bubble?