If Gas is the only state of matter where you can change the density with pressure, how can you pressurise liquids like water?

Question

I know that solids and liquids can’t change density without changing their molecular structure, so how do things like oil pressure and water pressure exist?

In: Physics

Answer 1

Well, you can’t. Water pressure is the term used in reference to the object onto which the water is applying force, or pressure.

For example, the water pressure at the bottom of the Marianas trench in enough to crush your average Mini Cooper, but if it’s only 30 feet under, the car won’t collapse. This has to do with the weight force applied onto the object by the water and not the density of the water.

EDIT: sorry, I’m stupid and as someone pointed out to me, the Mini Cooper would have to be an enclosed object to actually crumble in the way I described it. Whoops.

Answer 2

Your premise is faulty.

You can certainly compress solids and liquids. In all the states, molecules will move when compressed.