noun
- The fundamental principle of physics that the total energy of an isolated system is constant despite internal changes.
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). first law of thermodynamics. Retrieved September 24, 2026, from http://smartdefine.org/first_law_of_thermodynamics/definitions/1276344 |
| Chicago | WordNet. 2010. "first law of thermodynamics" http://smartdefine.org/first_law_of_thermodynamics/definitions/1276344 (accessed September 24, 2026). |
| Harvard | WordNet 2010, first law of thermodynamics, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/first_law_of_thermodynamics/definitions/1276344>. |
| MLA | WordNet. "first law of thermodynamics" 23 October 2010. Web. 24 September 2026. <http://smartdefine.org/first_law_of_thermodynamics/definitions/1276344> |