Question

The absolute viscosity of the oil can be given as _____________

(a) ŋ = k{(t1D2)/(t2D1)}

(b) ŋ = k{(t1D2)+(t2D1)}

(c) ŋ = k{(t1D2)(t2D1)}

(d) ŋ = k{(t1D2)-(t2D1)}

I have been asked this question by my school principal while I was bunking the class.

Origin of the question is Viscosity and Viscosity Index in portion Lubricants of Applied Chemistry

Answer 1

Right option is (a) ŋ = k{(t1D2)/(t2D1)}

Explanation: By performing the redwood viscometer experiment, we can know the absolute viscosity of the oils. The absolute viscosity of the oils can be given by ŋ=k{(t1D2)/(t2D1)} where, t1=time in seconds, taken for the flow of the 50 c.c of oil, t2=time in seconds, taken for the flow of 50 c.c standard oil or liquid. D1=specific gravity of the oil to be tested. D2=specific gravity of the standard liquid. K = arbitrary constant.