Define lubricant. Give the classification of lubricants with at least one example of each type.

Define lubricant. Give the classification of lubricants with at least one example of each type.
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1 Answer

Answer :

Lubricant: Any substance introduced between two moving or sliding surface to reduce the frictional resistance between them is known as lubricant.

Classification:

i) Solid lubricants:

Examples: graphite, molybdenum disulphide, soap, soapstone, wax, talc, chalk, mica etc

ii) Semi-solid lubricants:

Examples: greases and Vaseline.

iii) Liquid lubricants:

Examples: vegetable and animal oils such as castor, olive, coconut, palm, neem, linseed, hazel nut, tallow, lard, whale, cod-liver oil etc. and fatty acids like oleic acid, Stearic acid etc., silicones, blended oils, and mineral oils.
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