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## Main Question or Discussion Point

Hi, I have a balloon filled with glass beads (exercise-stress ball). When I squeeze the balloon, it changes its shape. Lets assume the initial shape is a sphere with radius R0 and thickness h0 and the final shape is like a pancake (cylinder R1 + half torus R2 with thickness h1). Can you help me to calculate the elastic energy stored in the balloon once I squeeze the balloon, please. Thanks in advance.