Now the other quantities are certain, just compare the heights, because narrow at the bottom and wide at the bottom, containing a certain amount of water (not full), and turn it upside down. So the height becomes higher and the pressure becomes higher. Because it is narrow at the top and wide at the bottom, some of the pressure is transmitted to the bottom of the container when it is upright, and some of it is dispersed to the walls of the container when it is inverted, so the pressure becomes less