Now I am just thinking about pressures and material strengths and I came across a question.To formulate the question I am going to explain a little bit of a thought situation. Normally if you would have a let's say sphere with very thick walls and you would increase pressure of a gas inside the sphere the pressure on the walls would bet higher and higher until the walls would give way and come apart. Now let's imagine a sphere in another sphere with sphere 1 is 1/2 as sphere 2.For the sake of argument let's assume that sphere 2 walls are of a infinitely strong material but sphere 1 that is inside sphere 2 is with normal metal walls of a given thickness etc. Now if sphere 2 can hold any pressure then putting higher and higher pressure in sphere 1 and putting the same amount of ever increasing pressure between sphere 1 and 2 would result in no failure ? As I understand if you have equal pressures from both sides of a wall or sphere or any physical object or construction then the object should hold even with huge pressures , ones that the object could never hold if the pressure would be just from one side? So for example if I have alot of spheres each next one bigger than the last and some free space between them , then if all of them would be made form the same metal with the same thickness the outer ones would have less pressure inside them but going smaller to the inner ones each next one could have higher pressure inside it because it would be smaller and thus the same material could hold bigger amounts of pressure in right ?