Why do porters place the load they have to carry, on a roll of cloth rather than directly on their head?
Porters place a round piece of cloth on their head when they carry heavy loads as the round piece of cloth increases the area on which the load is placed. We know that when the surface area is more then pressure is less. As a result, the pressure on their heads gets reduced. Hence, porters place the load they have to carry, on a roll of cloth rather than directly on their head.