  In this paper, using an unified approach, estimates are given of the
magnitude of the surface tension of water for planar and curved interfaces in
the pairwase interaction approximation based on the Lennard-Jones potential. It
is shown that the surface tensions of a bubble and droplet have qualitatively
different dependences on the curvature of the surface: for the bubble, as the
radius of the surface's curvature decreases, the surface tension decreases,
whereas it increases on the droplet. The corresponding values of the Tolman
corrections are also determined. In addition, it is shown that the dependence
of the surface tension on the surface's curvature is important for evaluating
the critical negative pressure for the onset of cavitation.
