The surface tension of a curved surface is defined as the integrated value of the difference between P
N (normal component of the pressure tensor to the surface) and P
T (tangential component). The above definition is consistent with the thermo dynamical one. P
T's are calculated with the help of the variation method for a cylindrical surface and a spherical one. Both take the same formula as obtained for the plane surface, except for the values of the distribution functions.P
N remains to be calculated in the next paper.
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