5.07 know and use the relationship for pressure difference: p = h × ρ × g

Pressure difference [Pa] = Density [kg/m³] x g [N/kg] x Height [m]

ΔP = ρ g h

• The equation can be used in liquids or gases provided you know their densities.

P₁ – P_atm = ρ g h

P₁ = ρ g h + P_atm