why do porters put cloth on their head while carrying heavy loads?
Placing the load on the turban increases the area on which the load is placed i.e. the area of contact of the load increases. When the area on which pressure of the load is exerted increases, the pressure per unit area decreases. As a result, the pressure on their heads get readuced. This is why porters wear turbans while carrying heavy loads.
in the expression "pressure=force/area" the area is in the denominator. thus increasing the area of contact will lead to decrease in pressure. when porters place a piece of cloth, the area of contact of the load with their head increases leading to decrease in pressure. this way they find it easier to carry the load