| 3C-2 : | Application of the Gibbs Phase Rule to the Triple Point | 2 pts |
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| How many intensive variables can be independently specified at the triple point of water ? | |||||||
| Read : | At the triple point, all three phases exist in equilibrium. | ||||||
| This is the unique aspect of the triple point and this problem. | |||||||
| Given : | Number of chemical species present: | C | 1 | ||||
| Number of phases present at equilibrium: | P | 3 | |||||
| Equation : | Gibbs Phase Rule : | oFree = C - P + 2 | |||||
| Solve : | oFree | 0 | |||||
| NO intensive variables can be independently specified at the triple point ! | |||||||
| This means that there is just one triple point and ALL of the properties of all of the phases are fixed ! | |||||||
| The triple point is unique. | |||||||
