Question

what is the role of a viscometer in the investigation? to measure the temperature of the oil to measure the color of the oil to measure the viscosity of the oil to measure the density of the oil

Explanation:

A viscometer is a scientific instrument specifically designed for measuring the viscosity of fluids. Viscosity refers to a fluid's resistance to flow. It has nothing to do with measuring temperature, color, or density.

Answer:

To measure the viscosity of the oil