While making this assignment, I checked the Environment Canada website for curre

Question

While making this assignment, I checked the Environment Canada website for current weather conditions in Halifax. The dew point temperature was 1.1 degree C, the pressure was 99.9 kPa, and the relative humidity was 70%. Apply the Gibbs phase rule to calculate the number of degrees of freedom (i.e., the number of independent intensive variables that must be specified to define the thermodynamic state of the system). Is the system underspecified, over-specified, or fully-defined? What was the outdoor temperature when 1 made this assignment?

Explanation / Answer

Gibbs phase rule is ,

F = C-P+2

Here components are air,water

Phase is 1.

F= 2-1+2 =3

We need to have 3 information for specifying this system.

We have info of pressure, dew temperature and relative humidity.

So, the system is fully defined.

From humidity charts , at this conditions, the temperature of sample gas is found to be 5.2 °C

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