  From the microscopic point of view almost all bonds between particles of
condensed substances must be performed by exchanges of virtual photons.
Consequently the duration of their virtuality must be longer than the extent of
their free path in the substance, the magnitudes of all expressions in such
inequality are known from low frequencies scattering. This approach allows to
suggest that the break of some set of bonds of particles, i.e. the phase
transitions, will be originated just at the reversing of established
inequality. Such assumption leads to definition of the radius of correlations
or bonds: $R_{c}\symbol{126} E^{-2/3}$ that proves the universality of this
critical index. The energies E, which can be liberated at phase transitions,
are definite for different types of critical phenomena. Reformulation of the
Ginzburg-Landau model of phase transitions via expansion of thermodynamic
potentials over $R_{c}$, instead temperatures distance, leads to the correct
system of all critical indices.
