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In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves over time. Exact conservation laws include conservation of energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge.
This chapter focuses on the several laws of chemical combination. The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction. This law is based on the fact that atoms are not composed or destroyed by a chemical reaction.