How does an increase in temperature affect oil viscosity?

An increase in temperature decreases oil viscosity. Viscosity is a measure of a fluid’s resistance to flow, and as the temperature rises, the energy of the oil molecules increases. This increase in molecular energy causes the molecules to move apart, allowing them to slide past each other more easily. Consequently, the oil becomes thinner and flows more readily, leading to a decrease in viscosity.

Understanding this relationship is critical for applications involving lubrication, fuel usage, and heat transfer, where the viscosity of oil can impact performance and efficiency. Low viscosity oils at high temperatures are generally preferred in engines and machinery, as they reduce friction and wear, improving overall system operation.