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(Solved): Define viscosity index. Find the viscosity index of an oil which has a kinematic viscosity at \( 4 ...
Define viscosity index. Find the viscosity index of an oil which has a kinematic viscosity at \( 40^{\circ} \mathrm{C} \) of \( v_{40}=135 \mathrm{cS} \) and at \( 100^{\circ} \mathrm{C} \) of \( v_{100}=17 \mathrm{cS} \).