what is liquid
The formation of a spherical droplet of liquid water minimizes the surface area, which is the natural result of surface tension in liquids. A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, and plasma), and is the only state with a definite volume but no fixed shape.