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.
Using the particle model to explain the properties of a Solid. 1  Solids have the greatest density (heaviest) because the particles are closest together. 2  Solids cannot flow freely like gases or liquids because the particles are strongly held in fixed positions.