A significant part of aeronautical science is a branch of dynamics called aerodynamics, which deals with the motion of air and the way that it interacts with objects in motion, such as an aircraft.
When you pour a liquid from one container to another, the liquid takes the shape of the container. The volume of the liquid is the same. The properties that solids and liquids share are that they both have definite volume.
There are four main points of difference by which we can differentiate between liquids and gases at the most basic level; shape, volume, hardness, and the capacity to flow. Liquids. The molecules of liquids have a moderate force of attraction; the force between molecules is less than solids and more than gases. This results in the movement of molecules more easily and freely within liquids. The molecular movement results in liquids having a definite and fixed volume.