the conservation of mass

The conservation of mass states that matter cannot be created or destroyed in a closed system. This means that the total amount of mass remains constant over time, even if it changes form or location. For example, when a substance heats up, it might change from a solid to a liquid or gas, but the total mass of all the resulting materials stays the same. This principle is fundamental in science and helps us understand that matter is conserved through physical and chemical processes.