This concept is called the law of conservation of matter.
What is law of conservation of matter?
- According to law of conservation of matter, "the mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another."
- The law of conservation of matter is a general law in chemistry applicable for any system closed to all transfers of matter and energy.
- According to this law, the mass of a substance or an object never changes over time, no matter how the constituent parts rearrange themselves. To put it in simple words, the mass can neither be created nor be destroyed.
- For e.g., Formation of water molecule whose molecular mass is 18, two hydrogen atoms with molecular mass of 2 reacts with the oxygen of molecular mass 16, thereby conserving the mass.
Therefore, matter can change their form through physical and chemical changes, but any of these changes of matter are conserved. The same amount of matter exist before the changes and after the changes. None is created nor destroyed.
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