Any substance which is used to reduce the roughness of a surface is called a:

Lubricant

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Lubrant

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Lubrication

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None of these

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Solution

The correct option is A Lubricant
A lubricant is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.

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Which of these substances help us to reduce friction between the surfaces?

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