88.2 Surface phenomenon of liquid 8.2.2 Curved surface and additional pressure Pm=P+△n(4p+c)ld=odA A=4r ex Ap= o8Ttrdr 2o 20 To increase the volume(dn of liquid at p Ap Laplace equation Ap+ dp( )   p dp dV dA + = pex p p p in ex = +Δ To increase the volume (dV) of liquid at pex = p + dp dA p dV   = 3 3 4 V = r 2 A = 4r 2 p r   = 2 8 2 4 rdr p r dr r      = = Laplace equation pin 8.2.2 Curved surface and additional pressure §8.2 Surface phenomenon of liquid