first law of thermodynamics
Noun
Meaning
the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
Source: WordNetSynonyms
Hypernyms
Examples
Gravitational interactions, in this case, circumvent (but do not violate) the first law of thermodynamics ( energy conservation ) and the second law of thermodynamics ( entropy and the arrow of time problem).
Since this process does not involve any heat transfer or work, the first law of thermodynamics then implies that the net internal energy change of the system is zero.
The reason is that calorimetry presupposes temperature as already defined before the statement of the first law of thermodynamics.
We start from the first law of thermodynamics for closed systems for an infinitesimal process: : Here, δQ is a small amount of heat added to the system, and δW a small amount of work performed by the system.