Water is the most familiar of all of the liquids, and some other examples include gasoline, milk, urine and blood. Wine, rubbing alcohol, coffee and honey are also liquids. Mercury and bromine are liquid elements.
A liquid is a state of matter with properties midway between gases and solids. Liquid molecules have less mutual attraction than those of solids and more mutual attraction than those of gases, which is why a liquid is not quite a solid, yet is still firmer than gas. Although they have a definite volume, liquids do not have their own defined shape. The receptacles that contain them determine their shape.
Liquids change form when exposed to extreme temperatures. Liquids can boil, evaporate, freeze, condense and form solutions. The particles in water are free to flow, but viscosity may prevent some thick liquids from flowing. A high-viscosity liquid, such as honey, does not flow as quickly as a low-viscosity liquid, such as water.
A Newtonian liquid always behaves like a liquid, regardless of how much force is applied to it. A non-Newtonian liquid differs in that its behavior changes upon application of force. One example of a non-Newtonian liquid is Oobleck, which exists in liquid form when uninterrupted but it behaves like a solid when subjected to force.