  A system of bosons studied within the mean field framework has two
fascinating phenomena: a liquid-gas first order phase transition and
Bose-Einstein condensation. Interplay between these two phenomena is being
investigated. Depending on the mean-field potential parameters one can observe
two types of critical points, called "Boltzmann" and "Bose", that belong to
different universality classes with distinct sets of critical exponents. As
examples of Bose and Boltzmann CPs pion and $\alpha$ matter are considered,
respectively. In general, the phase diagram can have one of the CPs or both of
them.
