Question

explain why porter's place a round piece of cloth on their heads when they carry heavy loads .

Answer 1

To overcome the pressure and give them a soft feel

Answer 2

Porters place a round piece of cloth on their head as this increases the surface area on which the luggage is to be placed. And we know that the pressure on a surface is inversely proportional to the pressure.
This also makes sure that the heavy luggage is not in direct contact with the head...

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