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新课程《物态和物态变化》相关备课认识(四)(原创)

yyezwcj 发表于 2005-12-20 16:27:41

表面张力和表面张力系数
液体表面各个部分之间的相互吸引力,叫表面张力。如同一根弹簧被拉伸后,其中的一圈与另一圈之间有收缩作用一样。
说明表面张力的方向垂直液面分界线,又与液面相切。
表面张力系数是液体表面上单位长度分界线上的表面张力。同一种液体温度升高,表面张力系数减小。不同液体表面张力系数不同,如水银的表面张力系数较大,而水又比酒精的表面张力系数大。

某些液体的表面张力(20 ℃时) σ/(×10-3 Nm-1)

物质

表面张力

物质

表面张力

72.8

硫酸

57.4

甘油

59.4

甲醇

22.6

煤油

28.90 ℃)

乙醇

22.8

蓖麻油

36.418 ℃)

丙醇

23.8

橄榄油

33.0618 ℃)

甲苯

28.5

石油

26.0

醋酸

27.8

硝酸

59.4

乙醚

16.9

丙酮

23.7

安尼林

42.9

29.0

465

硝基苯

43.9

   

Re:新课程《物态和物态变化》相关备课认识(四)(原创)

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