What is the approximate draw point temperature of a parcel of air that contains

Question

What is the approximate draw point temperature of a parcel of air that contains 20g of water vapor at 30 degree C? Example: Air cannot contain more than 100% relative humidity. Air at 100% relative humidity is saturated; at that temperature, it cannot contain any more water vapor than it already has. A cooling parcel of air with 10g of water vapor per kg of air will reach dew point temperature at about 10 degree C. If the air cools to 0 degree C, the maximum amount of water vapor the air can contain at 0 degree is only 5 g/kg. The excess water vapor will condense out as liquid water. 10g/kg - 5g/kg = 5 g of liquid water When saturated air at 20 degree C cools to 5 degree C, approximately how many grams of water vapor will condense into liquid water?

Explanation / Answer

At 20 degree celcius the 15 grams of water from water vapour

Then cools to 5 degree celcius it gives 7 grams of water from water vapour

= 15 g/kg -7 g/kg

= 8 g of liquid water

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