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单位面积内聚功在等温、等压条件下,使一种液体〈或固体〉柱垂直于其轴线可逆地分离,并生成两个新的表面时,单位面积所做的功。功的数值等于表面张力的两倍，即 Wσ = 2γɑ
expl. work of cohesion per unit area

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