Surface Energy Surface Tension S.J.T.U. Phase Transformation and Applications Page 7/42 Image a film of liquid stretched on a frame -dx- 21ydx =Fdx Film Y=F/21 Y Surface energy with units of Y←一≥f dynes per centimeter,or newtons per meter in the SI Soap film system. Y←—>f Detail of wire Figure 4.1 Stretching a film-increasing area. SJTU Thermodynamics of Materials Spring2o08©X.J.Jin Lecture 20 surfacePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 20 surface Page 7/42 Surface Energy / Surface Tension Image a film of liquid stretched on a frame 2 γ = Fdxdxl γ = 2/ lF γ Surface energy with units of dynes per centimeter, or newtons per meter in the SI system. dx