What is meaning of term valid in simple language like this theory is valid for only law of conservation of mass so valid is what
Solution:-Valid means it follows that so if you say this theory is valid for law of conservation of mass then it means that the given particular theory is only for law of conservation of mass.
"The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”
"The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”