A steady-state equation describing the self-heating of a material due
to oxidation, hydrolysis, and the evaporation and condensation of wate
r was introduced recently by Sisson et al. (1993, IMA J. Appl. Math. 5
0, 285), and some preliminary existence and uniqueness results were de
rived. In this paper a numerical study of the equation is undertaken.
Critical behaviour and the disappearance of criticality is observed.