Wet van Bernoulli in Pa , druk
$$ p_1 + \rho_1 \cdot g \cdot z_1 + \rho_1 \cdot \frac{v_1^2}{2} = p_2 + \rho_2 \cdot g \cdot z_2 + \rho_2 \cdot \frac{v_2^2}{2} + \Delta E_{12} $$