Hey, Can anyone help me with my imaginary experiment? In a large glass tank I place air-filled balls of thin rubber (like a balloon but perfectly spherical). I fill the tank to the top with the rubber balls, seal the lid and evacuate the tank of air. The internal pressure difference causes the balls to completely fill the vacuum. But what shape do the balls take? Ignoring any effects caused by the balls distorted against the wall of the tank and any gravitational effects. Trying to imagine this shape without doing the experiment has proved torturous for me. The structure is clearly going to be crystalline in nature but I need to determine exactly how. Can anybody help? It's a helluva lot tougher than it sounds.