All liquids are fluids but not all fluids are liquids. Fluids are described as something that can flow as a result of a pressure differential between two points. Liquids, on the other hand, are a subset of liquids.

Are fluids liquids?

A fluid is a state of matter that yields to sideways or shearing forces. Liquids and gases are both fluids. Fluid statics is the physics of stationary fluids.

Are there any liquids that aren't fluids?

Oobleck is a milky-white, shiny substance known as a non-Newtonian fluid. It flows like thick paint when you pour it, but mash your hand onto its surface and it forms a hard skin. Squeeze some in your palm and it will form a tough glob. ... Oobleck is actually a pretty simple mixture of cornstarch and water.