The different states of matter have characteristics that are determined by the arrangement and interactions of the particles. The particles within a sulid are arranged in an orderly pattern. Particles in a liquid are free to move in all directions, but they maintain contact with surrounding particles. Particles in a gas are essentially independent of all surrounding particles. They interact with each other in elastic collisions.
Pressure is the force exerted per unit of surface area.
In fluids, it is the result of cullisions of particles with the surface. Surface tension and capillary action are phenomena that result from the attractive forces of particles in a liquid. D. Viscosity of a fluid and pressure exerted on the fluid influence the motion of the fluid. Conversely, a moving fluid can interact with objects to exert forces on the objects. Pressure differences cause water to flow in restricted spaces.