First law of thermodynamics and Law of conservation of energy

First law of thermodynamics noun - The fundamental principle of physics that the total energy of an isolated system is constant despite internal changes.

Law of conservation of energy is a synonym for first law of thermodynamics. In some cases you can use "Law of conservation of energy" instead a noun phrase "First law of thermodynamics".

Law of conservation of energy noun - The fundamental principle of physics that the total energy of an isolated system is constant despite internal changes.

First law of thermodynamics is a synonym for law of conservation of energy. You can use "First law of thermodynamics" instead a noun phrase "Law of conservation of energy".