The Eiffel Tower in Paris rests on 450 m2 ground and exerts a pressure of 20kPa, determine the weight of the tower.

S = 450 m ^ 2.
P = 20 kPa = 20,000 Pa.
F -?
The pressure P is called the force F, calculated per unit area S and is determined by the formula: P = F / S.
The weight of a body is the force F with which this body presses on the support or stretches the suspension.
F = P * S.
F = 20,000 Pa * 450 m ^ 2 = 9,000,000 N = 9 MN.
Answer: The weight of the Eiffel Tower is F = 9,000,000 N = 9 MN.