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10 10 70 35 35 20 15 10 15 10 -20-15-10-5051015 20 25 30 35 40 Temperature C 1.

ID: 287619 • Letter: 1

Question

10 10 70 35 35 20 15 10 15 10 -20-15-10-5051015 20 25 30 35 40 Temperature C 1. Use the Clausius-Clapyron diagram above to determine if you will see your breath outside while walking to your favorite meteorology class. The weather outside is 0 degrees Celsius and is close to saturation. Your breath is 37 C (98.6 F) and is at 60% relative humidity. Assume that upon exhalation, your breath will mix at the ratio of 50% outside air and 50% breath. (Do a weighted average to create a mixture of the air outside and the air inside. For example: (0.5xTemperature of outside air) + (0.5x Temperature of your breath) Temperature of mixture and (0.5 x Actual Specific Humidity outside air)(05 Actual Specific Humidity of breath) = Actual Specific Humidity of the mixture) Fill out the table below to determine if you will see you breath: Air Oustide Mixture (50% outside and 50% Breath) Actual Specific Humidity Saturation Specific Humidity Relative Humidity

Explanation / Answer

If the outside is saturated, i.e R.H = 100%, then the mixture of air and breath wil be visible according to the following data:

Air outside

Breath

Mixture

Temperature

0C

37C

18.5C

Actual specific humidity (q)

2 g/kg

37 g/kg

19.5 g/kg

Saturation specific humidity (qs)

2 g/kg

61.6 g/kg

31.8 g/kg

Relative humidity (RH)

100%

60%

80%

Note that q/qs = RH. The mixture lies above the Clausius Clapeyron curve, implying it will be in the liquid phase.

Air outside

Breath

Mixture

Temperature

0C

37C

18.5C

Actual specific humidity (q)

2 g/kg

37 g/kg

19.5 g/kg

Saturation specific humidity (qs)

2 g/kg

61.6 g/kg

31.8 g/kg

Relative humidity (RH)

100%

60%

80%