Correct your mistake first, 1 ml = 1 cubic centimeter; 35 centimeters is not the area at the bottom of the bottle! I made it as if it were 35 square centimeters, and the same goes for bottle caps!

(1) The net weight of this bottle of pure water is: 600 grams

(2) The pressure on the sponge when the bottle is placed is: 1714.3N/m2. The bottle is inverted. The release pressure is 8571.4N/m2

(3) The fundamental reason why the pressure generated by the same bottle of pure water on the sponge is different is: the force is the same but the force area is different

(4 ) To make the pressure on the sponge when the bottle is placed upside down be the same as when it is placed upright, the simple method is: pour out 480ml of water, and then place the bottle upside down!

If you still have any questions, please send me a message...