Who is the Father of Chemistry? Your best answer probably is Antoine Lavoisier. Lavoisier wrote the book Elements of Chemistry (1787).
He compiled the first complete (at that time) list of elements, discovered and named oxygen and hydrogen, helped develop the metric system, helped revise and standardize Chemical nomenclature and discovered that matter retains its mass even when it changes forms.
Among the most famous scientific laws is the law of conservation of mass, which is also known as the principle of mass/matter conservation.
Example showing Law of Conservation Of Mass in an open system.
Law Of Conservation Of Mass :
The law of conservation of mass states that the total mass present before a chemical reaction is the same as the total mass present after the chemical reaction, thus, mass is conserved.
Law of conservation of mass in observed in the given example1. The given conical flask with a stopper is considered as a closed system. So, mass of reactants before the reaction is same as the mass of the products after the reaction.
Combustion of wood which is burning in presence of oxygen gives ashes, carbondioxide and water vapour. This reaction also follows Law of conservation of mass. Since the reaction is performed in an open system the mass of gases that escapes also counts. The same experiment can be performed in a closed system and relate it to the results of the open system . In both the cases Law of Conservation Of Mass is followed.