Q. 194.0( 8 Votes )

Explain why the s

Answer :

The surface of mortar and pestle used for grinding is etched again after prolonged use because:

The mortar and pestle lose their roughness after prolonged use (using for long time).

As a result, the force of friction decreases and they do not grind properly.

So they are etched to make them more effective for grinding again.

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