  Surface analyses inside the nanopore, micropore, and a very narrow pipe are
important topics for development of the chemical engineering. Here, we propose
a measuring method which evaluates the surface coverage of the chemically
modified pore surface and the corrosion rate of the inner surface of the narrow
pipe, etc. The method uses Kelvin's equation that expresses saturated vapor
pressure of a liquid in the pore (pipe). The surface coverage and the corrosion
rate are calculated by measuring saturated vapor pressure of the liquid in the
pore and the pipe, respectively. In this letter, we explain the concept of the
method briefly.
