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===About Conservation of Mass===
: In a [[Chemical Reaction|chemical reaction]] law of '''conservation of mass''' indicates that the total [[mass]] of the [[product]]s is the same as the total [[mass]] of the [[reactant]]s.
: '''Conservation of mass''' can be [[observed]] in [[Closed System|closed system]]s in which none of the [[product]]s can escape and no other [[chemical]]s enter the [[system]].
: In an [[Open System|open system]] any [[Chemical Reaction|chemical reaction]] which [[product|produces]] a [[gas]] will appear to decrease in [[mass]] but only because the [[mass]] has moved to a different location.
===Examples===