1. Air at 15° C can hold 10 g/kg of water vapor. What is the relative humidity i
ID: 284869 • Letter: 1
Question
1. Air at 15° C can hold 10 g/kg of water vapor. What is the relative humidity if the actual content is:
2 g/kg
5 g/kg
7 g/kg
2. The actual humidity of an air parcel is 5 g/kg. What is the relative humidity at the following temperatures (specific humidity)?
25° C (20 g/kg)
15° C (10 g/kg)
5° C (5 g/kg)
3. What is the relative humidity if the dry bulb reading is 20° C and the wet bulb reading is 18° C? What is the dew point?
4. What is the relative humidity if the dry bulb reading is 30° C and the wet bulb reading is 23° C? What is the dew point?
Explanation / Answer
1)Relative humidity is a very common measurement that is used to describe how much water vapor is in the air. In general, it expresses how close the air is to reaching its water vapor capacity. Relative humidity is the ratio of the air's water vapor content (amount actually in the air) to its water vapor capacity at a given temperature, expressed as a percent. The general formula is:
Relative Humidity (%) = (Water vapor content / Water vapor capacity) * 100%
Relative humidity if the actual content is:
if 2 g/kg =2/10*100 = 20%
Therefore the relative humidity of air is 20% if the actual content is 2kg/g.
2)Relative humidity if the actual content is:
if 5 g/kg = 5/10*100 =50%
Therefore the relative humidity of air is 50% if the actual content is 5kg/g.
3)Relative humidity if the actual content is:
if 7 g/kg = 7/10*100 = 70%
Therefore the relative humidity of air is 70% if the actual content is 7kg/g
2)Relative humidity can be calculated by measuring ratio of water vapor content and the amount of water vapor required for the saturation at the temperature or pressure.
saturation mixing ratio of air parcel at 25 degrees is 20g/kg.
Substitute 5g for Water vapor content for kilogram of air and 20 for water vapor saturation in an amount of I kg solution as saturation mixing ratio Calculate the percentage of relative humidity.
Relative humidity =5g/20g*100= 25%
saturation mixing ratio of air parcel at 15 degrees is 10g/kg.
Substitute 5g for Water vapor content for kilogram of air and 10 for water vapor saturation in an amount of I kg solution as saturation mixing ratio Calculate the percentage of relative humidity.
Relative humidity =5g/10g*100= 50%
saturation mixing ratio of air parcel at 5 degrees is 5g/kg.
Substitute 5g for Water vapor content for kilogram of air and 5 for water vapor saturation in an amount of I kg solution as saturation mixing ratio Calculate the percentage of relative humidity.
Relative humidity =5g/5g*100= 100%
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