Ans-: On the basis of their physical state, lubricants can be classified as:
(i) Lubricating oil (or liquid lubricants)
(ii) Solid lubricants
(iii) Greases (or Semi-solid lubricants)
(iv) Emulsion lubricants
(v) Synthetic lubricants
(vi) Biodegradable lubricants
Tags
lubricants