p = h_{V A} \cdot ρ_{A} \cdot g + h_{V B} \cdot ρ_{B} \cdot g = h_{S A} \cdot ρ_{A} \cdot g + h_{S B} \cdot ρ_{B} \cdot g

${p=h_{VA}\cdot \rho_A \cdot g + h_{VB}\cdot \rho_B \cdot g = h_{SA}\cdot \rho_A \cdot g + h_{SB}\cdot \rho_B \cdot g \quad}$