A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.

It describes the internal friction of a moving fluid. However, if it is around 90 В° C, that is, close to boiling, its viscosity varies and decreases to 0.32 Г— 10 -3 (N s) / m 2. Viscosity is a measure of a fluid's resistance to flow. It is important when measuring viscosity that the temperature of the cup and the liquid is maintained. The viscosity of water at a temperature of about 20 В° C is 1 Г— 10 -3 (N s) / m 2. A viscosity cup, such as the Ford 4 provides an approximate viscosity measure and can be purchased at little expense from the internet. This property varies according to the velocity gradient of matter. It is the result of dividing the shear stress (for example, when we put a knife in mayonnaise) by the deformation rate of the fluid. It is the viscosity that a conventional fluid exhibits against traction forces, representing the relationship between stress and strain rate. In a fluid at constant temperature, the kinematic viscosity will be calculated by dividing the dynamics by the density of the fluid, and expressing the result in square meters per second. This also depends on the temperature : the higher the temperature, the lower the viscosity. It is measured, according to the International System (SI) in pascal-seconds. Also called absolute viscosity, it is understood as the relationship between the velocity gradient (speed of movement of the particles) and the shear stress.

What does viscosity mean