上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Introduction:Surface energy Image a film of liquid stretched on a frame 2dFd →dx- Y=F/21 Y Surface energy with units of 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. Surface energy=surface tension 表面能=表面张力 6Introduction: Surface energy 6 Surface energy= surface tension 表面能=表面张力