first law of thermodynamics(redirected from 1st Law)
Also found in: Thesaurus, Medical, Encyclopedia.
Switch to new thesaurus
|Noun||1.||first law of thermodynamics - the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes|
law of thermodynamics - (physics) a law governing the relations between states of energy in a closed system
conservation - (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations