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19.63 square inches are in the area of a 5-inch diameter circle.
There are 100*pi square inches in a 20 inch diameter circle
The answer depends on what the 5 inches refers to!
*1/1000 inch bullet diameter *16/1000 inch neck diameter *16/1000 inch base diameter *16/1000 inch rim diameter *365/1000 inch case length *457/1000 inch cartridge length and depending on the powder used, the 22 Winchester Magnum Rimfire can have almost twice the muzzle velocity and muzzle energy as the 22 Long Rifle.
The diameter of the water column does not affect the pressure.It is the height of the column that determines the pressure at the base.(and also the barometric pressure and temperature).