Expressions for P
N's, the normal components of the pressure tensors to a cylindrical surface and a spherical one are obtained in accordance with a mechanical definition. The statistical-mechanical expressions for the surface tensions of a cylindrical surface and a spherical one are given in terms of P
N and P
T. Another definition of surface tension referred to the surface of tension is proposed and applied to obtain the statistical-mechanical expressions for the surface tensions in terms of P
T and hydrostatic pressures in gas phase and in liquid one. The difference between the two definitions mentioned above will be discussed in the next paper.
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