law of conservation of mass vs conservation of mass

law of conservation of mass and conservation of mass both are nouns.

Word	Noun	Adjective	Verb	Adverb
law of conservation of mass	Yes	No	No	No
conservation of mass	Yes	No	No	No

As nouns, law of conservation of mass and conservation of mass are synonyms defined as:

law of conservation of mass and conservation of mass: a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system

Other synonyms of law of conservation of mass include conservation of matter, law of conservation of matter.

law of conservation of mass (noun)	conservation of mass (noun)
a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system	a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system