Changes

The law conservation of mass states that within a closed system, the total mass remains constant, regardless of the processes taking place in that system.<ref>http://dbhs.wvusd.k12.ca.us/webdocs/Thermochem/Law-Cons-Mass-Energy.html</ref> Strictly speaking, this law only applies under certain circumstances, such as when dealing with [[chemical reactions]]. Nuclear reactions are exempt from this rule.

The '''law of conservation of mass''' states that within a closed system, the total mass remains constant, regardless of the processes taking place in that system.<ref>http://dbhs.wvusd.k12.ca.us/webdocs/Thermochem/Law-Cons-Mass-Energy.html</ref> Strictly speaking, this law only applies under certain circumstances, such as when dealing with [[chemical reactions]]. Nuclear reactions are exempt from this rule.

The law of Mass Conservation is a development of Lavoisier's experimental discovery that, when all substances were properly accounted for&mdash;specifically gases, during the process of combustion&mdash;the total weight of a closed system is not changed by a chemical reaction.  

The law of Mass Conservation is a development of Lavoisier's experimental discovery that, when all substances were properly accounted for&mdash;specifically gases, during the process of combustion&mdash;the total weight of a closed system is not changed by a chemical reaction.