How to sign: the process of becoming hard or solid by cooling or drying or crystallization
"the hardening of concrete"; "he tested the set of the glue";
Similiar / Same: solidifying, solidification, curing, set
Categories: action, activity, natural action, natural process
Within this category: congealment
How to sign: the act of making something harder (firmer or tighter or more compact)
Categories: change of integrity
Within this category: annealing