Law of Conservation of Mass: Mass is conserved in chemical reactions, as shown in the combustion of methane.
Diagram illustrating the Law of Conservation of Mass in a chemical reaction, showing methane (CH₄) reacting with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O), with masses of 16 g and 64 g on the reactant side totaling 80 g, and 44 g and 36 g on the product side also totaling 80 g.