The T and N vectors at two points on a plane curve, a translated version of the second frame (dotted), and the change in T: δT'. δs is the distance between the points. In the limit will be in the direction N and the curvature describes the speed of rotation of the frame.
https://en.wikipedia.org/wiki/Frenet%E2%80%93Serret_formulas
沿环四周,AB以外表面对AB面
有表面张力,与周界垂直,与液面
相切,大小相等,但不在同一平
面上,产生一个向下的合力
(3)凹面:
AB为弦长球形凹面环作边界
环上每点受来自AB外表面的表
面张力,与周边垂直,与凹面相
切,大小相等,不在同一平面,
产生一个向上的合力
周边合力为附加压力ps
凹面受向下的总压po- ps
比平面受力小
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