Cellophane is so thin and flimsy. What makes the wrapper on my Ritz crackers crackle and crinkle like a firework?
In: Physics
Sound is the vibration of air, cellophane and other thin film like materials function like membranes in that their large surface area pushes a lot of air around when they move and deform, the elasticity of the materials and some of their other features such as the creases and folds make for some rather ‘violent’ motions within the material itself that make it momentarily push even more air around when you squish it around.
The membrane in your loud speaker is also thin and flimsy, move it around fast enough and it can push enough air to get pretty loud.
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