I know that using the console, I can make plasma turn to noble after the life of plasma reaches zero, but is it possible for plasma to turn into other elements (e.g. ice) once its life reaches zero?
https://github.com/simtr/The-Powder-Toy/blob/master/src/simulation/elements/FIRE.cpp#L55
It seems like it's possible to create DSTW, I don't know how(something with tmp)
Fire/plasma created by burning oxygen and hydrogen together has tmp=3, and will turn into DSTW when its life reaches 0. If you make the plasma cold enough, the DSTW will quickly turn into ICE.
There is no way to make plasma turn into arbitrary elements (other than by using CONV, of course).