Based on the Gibbs phase rule, how many degrees of freedom are present at the triple point of water?

Based on the Gibbs phase rule, how many degrees of freedom are present at the triple point of water? Correct Answer 0

According to the Gibbs phase rule, a single component system has no degrees of freedom when the three phases exist in equilibrium and the system is invariant.

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How far is point 'R' from Point 'T'? Statement (I): Point 'R' is 5 metres to the north of point 'M'. Point 'U' is 4 metres to the east of point 'R'. Point 'T' is to the west of point 'R' such that points 'U' 'R' and 'T' form a straight line of  metres. Statement (II): Point 'Z' is metres to the south of point 'T'. Point 'U' is  metres to the east of point 'T'. Point 'M' is  metres to the east of point 'Z'. Point 'R' is  metres to the north of point 'M'. Point 'R' lies on the line formed by joining points 'T' and 'U'.
Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as
Statement (I): The three phase (triple State/point) of a single component system possesses a single set of properties. Statement (II): For a single component system, the Gibbs phase rule, F = C + 2 - P (where F is number of independent intensive properties, C is number of components in the system and P is number of phases), reduces to F = 3 - P.