Derive the formula for calculating the fluid pressure at the bottom of a rectangular parallelepiped-shaped vessel.

m = pv, v – psh, m – csh.

P = mg, P = gpsh.

p = p / s, p = gpsh / s, p = pgh,
where m is the mass of the liquid
p is the density of the liquid
V is the volume of liquid poured into the vessel
S – the area of the bottom of the vessel
h – height of the liquid column
P is the weight of the liquid

p is the pressure produced by the liquid
g – acceleration of gravity