||Message]
Category:
- There exist particular states of simple systems, that are characterized, macroscopically by the internal energy, the volume $V$ and the mole numbers $N_1,N_2,\cdots,N_k$ of the chemical components.
- There exists a function, called the entropy $S$ of the extensive parameters of any composite system, defined for all equilibrium states and having the following property: The values assumed by the extensive parameters in the absence of an internal constraint are those that maximize the entropy over the manifold of constrained equilibrium states.
- The entropy of a composite system is additive over the constituent subsystems. The entropy is continuous and differentiable and is monotonically increasing function of energy.
- The entropy of any system vanishes in the state for which $$ \left({\partial U\over\partial S}\right)_{V,N_1,\cdots,N_k}=0 $$ This condition means that the entropy vanishes at absolute zero temperature.
An understanding of postulates requires clear understanding of the following concepts
- Internal energy
- Entropy
- Equilibrium states
- Extensive parameters
- Internal constraints
- Additive property of entropy
- Temperature as defined by $\displaystyle{\left({\partial U\over\partial S}\right)_{V,N}}$
Download: th-lec-09001.pdf (39.39 KB)Exclude node summary :
n
Exclude node links:
0
4727: Diamond Point
700
0
