if a lubricating oil has a low Viscosity Index, this indeicates that
as the temperature rises, the viscosity decreases a (relatively) lot.
When that occurs, has energy been consumed?
If so, and we decrease the temperature, is the energy (in theory)
recoverable? (if not, it presumably means that entropy has
If yes, it means that the lube oil is storing energy. What would be
the name of the parameter which indicates the energy-storage-density
of the substance?
14 years ago