Question

Calculate the pressure due to a water column of height 120m ( take density of water = 1000 kg/m raise to 3, g = 10 m/s raise to 2

Answer 1

P = ρ g H familiar expression for pressure due to column of liquid

P = 1000 kg/m^3 * 10 m/s^2 ^ 120 m = 1,200,000 kg / m/s^2

Can also be written P = 1.2E6 kg / (m/s^2)

Usually written as 1.2E6 N/m^2

Standard atmospheric pressure is written as

1.01E5 N/m^2

So the pressure due to the column of water would be about 12 X

that of a column of water as given