> If you pressurize a sealed cavity with a gas, it's not going to move due to the internal pressure regardless of what shape you make it. That's true of the co

> If you pressurize a sealed cavity with a gas, it's not going to move due to the internal pressure regardless of what shape you make it. That's true of the container as a whole, but if you put a delicate torsion balance inside the container, you could see many kinds of apparent anomalies caused by circulating gases at different temperatures. At sufficiently high sensitivity even a vacuum vessel would show some anomalies arising in ordinary physics that would need to be taken into account.