Question

Earlier I asked for a definition of non-volatile. Given the fact that it won't evaporate at all, does it mean that a non-volatile substance is stable in whatever state it is in at room temperature?

Thanks again ahead of time

Not necessarily. Non-volatile means it won't evaporate. It is stable relative to its volatility (or lack therof) but it may not be stable otherwise. For example, it may be radioactive and emit alpha/beta particles or gamma rays. Or a metal might combine with oxygen of the air to form the oxide. Etc.

Thanks for the explanation!