  The study considers advantages of the introduced measure of time based on the
entropy change under irreversible processes (entropy production). Using the
example of non-equilibrium expansion of an ideal gas in vacuum, such a measure
is introduced with the help of Boltzmann's classic entropy. It is shown that,
in the general case, this measure of time proves to be nonlinearly related to
the reference measure assumed uniform by convention. The connection between
this result and the results of other authors investigating measure of time in
some biological and cosmological problems is noted.
