Viscosity tends to fall as temperature increases (for example, water viscosity goes from 1.79 cP to 0.28 cP in the temperature range from 0 ☌ to 100 ☌) see temperature dependence of liquid viscosity for more details.Viscosity is independent of pressure (except at very high pressure) and.This leads to an additional contribution to the shear stress though the exact mechanics of this are still controversial. In liquids, the additional forces between molecules become important. Viscosity is independent of pressure and *Viscosity increases as temperature increases.The kinetic theory of gases allows accurate prediction of the behaviour of gaseous viscosity, in particular that, within the regime where the theory is applicable: Viscosity in gases arises principally from the molecular diffusion that transports momentum between layers of flow. This ratio is characterised by the kinematic viscosity, defined as follows: In many situations, we are concerned with the ratio of the viscous force to the inertial force, the latter characterised by the fluid density ρ. Thus, water is "thin", having a low viscosity, while vegetable oil is "thick" having a high viscosity. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. It is commonly perceived as "thickness", or resistance to pouring.
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