I'm developing an experiment where an exothermic reaction will evolve water as an unavoidable byproduct, and for containment purposes I'll be using a sealed 25cc steel reaction vessel for initial testing. The question I'm posting here is for the purposes of safety and control, acknowledging fully that there is some risk involved and that nobody responding here will be held responsible for what happens. The question is: How do I determine how much pressure will be produced within the container as the steam forms from the reactants? The steam tables I'm familiar with are geared more for piping transport and work than for containment problems like this one. I'm specifically interested in arriving at a maximum upper limit for steam which will not rupture the container, and from there allowing a 20% safety margin below that for a safe maximum yield. The reaction is expected to take place at around 650° C. It would be helpful if someone could direct me to the math so that if the project increases in scale we can compensate appropriately.