The Law of Conservation of Matter/Mass Chastain 2017
What is the Law of Conservation of Matter/Mass? Mass or Matter cannot be created or destroyed! http://www.nuclear-power.net/laws-of-conservation/law-of-conservation-of- matter/
The conservation laws describe physical properties that remain constant throughout the various processes that occur in the physical world. In physics, "to conserve" something means "to result in no net loss of" that particular component. This means nothing is lost or gained. It remains the same just in a different form.
Crash Course https://www.youtube.com/watch?v=3lHHOiTdmK4