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

Most of the water pressure you experience in your home comes from water towers. Water is pumped up into the tower and gravity pulls down on the water providing pressure at your sink.

Or if you fill a tank with water then pump air into the tank the air acts as a spring putting pressure on the water.