Sep 23 2013
There is an exponential (or logarithmic) dependency between viscosity n and temperature T, where A and dEvis are constants specific for each liquid and R is the universal gas constant.
Also note, there is a conversion formula v = n/p with v being the kinematic viscosity and n the dynamic viscosity.
So plotting log(n) against 1/T (in Kelvin) gives a straight line, therefore the higher the temperature T, the smaller is 1/T and the lower is viscosity n of the liquid.
In Hildebrand's formula, that viscosity is related to the ratio between free volume and occupied volume (Vo), where B is another constant and V is the actual volume.
One must note that in the latter formula, the temperature is implicitly represented in the volume V as most liquids expand when heated.
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