1.1 Basic fluid properties
1.One of the most important primary properties of a fluid (liquid or gas) is its viscosity — its
2.resistance to flow or to objects passing through it.
3.Conceptually, viscosity might be thought of as the ‘thickness’ of a fluid.
4.In essence it is an internal frictional force between the different
layers of the fluid as they move past one another.
5.In a liquid, this is due to the cohesive forces between the molecules whilst in a gas it arises from collisions between the molecules.