I'm a physics noob but this is something I was thinking about when I read in my textbook that fluids are generally incompressible. Let's say I had 1000 L of water enclosed in a sphere several meters thick (say, 2 meters thick) made of an extremely hard, dense metal with 0 outlets or holes of any kind. (Some other material other than metal might be better for this, since metals are malleable and can be punctured with high pressure.) The water is perfectly enclosed in the sphere, which has a volume of exactly 1000 L. Let's say this sphere was constructed in such a way that it could be radius could be reduced uniformly so that I can keep "squeezing" the water inside. Maybe the plates of the sphere on the outside slide over each other or something. What happens to the water as I keep compressing? Does it just turn into a gas? What kinds of forces are exerted by the water on the sphere? Could I do this without shattering the sphere?