What is meant by viscosity and viscosity index? Its other units are newton-second per square metre (N s m-2) or pascal-second (Pa s.) The dimensional formula of viscosity is. The SI unit of viscosity is poiseiulle (PI). Viscosity is a measure of a fluid’s resistance to flow. What is meant by viscosity index?ĭefinition of viscosity index : an arbitrary number assigned as a measure of the constancy of the viscosity of a lubricating oil with change of temperature with higher numbers indicating viscosities that change little with temperature. The VI of a highly refined mineral oil (hydrotreated) can be up to 120. A traditional mineral oil has a viscosity index between 95 to 100. These measurements are then compared to the results of two reference oils. The viscosity index of a lubricant is determined by measuring the kinematic viscosity at 40☌ and 100☌. 9 Is there any formula to calculate viscosity index?.7 What does the number in 4 2 valve means?.6 What is the formula of viscous force?.1 How do you calculate viscosity index?.
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