Young-Laplace equation in Fluid Mechanics EDIT: I meant the Young-Laplace equation, of course, not the Young-Lagrange.. sorry! Heya! According to said equation, ΔP*area = γ*circumference, for an interface of spherical fluid-element. Can I pls get some explanations? 1) Why is tension, or γ, purely a result of chemical forces? Isn't there a pressure parallel to the surface, just like there is a pressure inside the fluid-element? Because if there were, the equation should be ΔP*area + P*area = γ*circumference. 2) Is there a physical explanation for the formula? Why does γ=ΔP*area/circumference?