  Employing the Schwinger's proper-time method, we calculate the $<\bar{\psi}
\psi>$-condensate for massive Dirac fermions of charge $e$ interacting with a
uniform magnetic field in a heat bath. We present general results for arbitrary
hierarchy of the energy scales involved, namely, the fermion mass $m$, the
magnetic field strength $\sqrt{eB}$ and temperature $T$. Moreover, we study
particular regimes in detail and reproduce some of the results calculated or
anticipated earlier in the literature. We also discuss possible applications of
our findings.

High Energy Physics - Phenomenology;High Energy Physics - Theory