Unusual liquids and Fluids of Materials by (Mukesh Kumar)

A liquid is a nearly in-compressible 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.

A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by inter-molecular bonds. Water is, by far, the most common liquid on Earth. Like a gas, a liquid is able to flow and take the shape of a container.

Most liquids resist compression, although others can be compressed. Unlike a gas, a liquid does not disperse to fill every space of a container, and maintains a fairly constant density.

A distinctive property of the liquid state is surface tension, leading to wetting phenomena. In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress.

Fluids are a subset of the phases of matter and include liquids, gases, plasma’s, and to some extent, plastic solids.

Fluids are substances that have zero shear modulus, or, in simpler terms, a fluid is a substance which cannot resist any shear force applied to it.