Final answer:
The equation for the weight of a water column is W = rhoVg.
Step-by-step explanation:
The equation for the weight of a water column is W = rhoVg, where rho is the density of water, V is the volume of water column, and g is the acceleration due to gravity.
For example, if the density of water is 1000 kg/m^3, the volume of water column is 1 m^3, and the acceleration due to gravity is 9.8 m/s^2, the weight of the water column would be 1000 kg/m^3 * 1 m^3 * 9.8 m/s^2 = 9800 N.