8
Redwood Viscometer No. 1
Aim
To determine the kinematic viscosity and absolute viscosity of the given thin sample of oil at various temperatures and to study the variations of viscosities with temperature using Redwood viscometer No. 1.
Principle
Viscosity is the property of a liquid by virtue of which it offers resistance to its own flow. The viscosity of liquids decreases with increasing temperature. The rate at which the viscosity changes with temperature is known as viscosity index.
VI = 
× 100
where VI = viscosity index
U = viscosity at 100°F of the oil under test
L = viscosity at 100°F of the low-viscosity standard oil (Gulf oil) having ...
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