留不住的是人心BYK
Surface tension 表面张力 Molecules in liquids have a high mobility (in solids, the molecules are fixed)分子在液态下有很高的活动性 In between the molecules there are cohesive forces 分子之间有内聚力 The higher these cohesive forces are, the higher the surface tension will be 内聚力越高， 内聚力越高，其表面张力越大 Water(polar)水:73 mN/m = strong cohesive forces内聚力强 Hydrocarbons (non-polar)烃类(非极性):23 mN/m = no cohesive forces 无内聚力 Liquids strive to minimize their surface area (lowest energy state) and tend to form spherical droplets 液体总是要将其表面积最小化(最低能量状态)并趋于形成球状液滴
