Dear friend, I will help you understand . 1-Do we have to use more or less energy/strength to pump water up to the top floor of a ten storeyed building than lift it upstairs in buckets? 2-How much water pumps how much water? When doctors give injections liquid medicine goes through a tiny hole befere it reaches the patients' bodies. Now make that syringe 1000 or 10000 bigger. Imagine a bottle shaped container that can contain 1000 litres of water. Put it in a deep swimming pool in the garden of a tall building. Put 5000 or 8000 or 10000 litres of water in a container in the air next to the top floor of that 40 or 50 or ... storeyed building. Connect the water above with 1000 litres of water below with a post to pump it. ................ Pumping water requires much less energy/strenght than lifting it like lifting iron or stone. So why should not water pump much more water than its own amount. Because pumping it easier than lifting it like lifting stone, the equilibrium ......(Yük çarpı yük kolu eşittir kuvvet çarpı kuvvet kolu:I don't know how it is in English) cannot be applicable to liquids. ( Note: I am not being allowed to sign in to my email address . ) Remember : Distant relatives are the best kind, and the further the better. Friendship is the best relationship.