At 10 a.m. on Monday at the start of class, the Charlottesville airport recorded
ID: 803953 • Letter: A
Question
At 10 a.m. on Monday at the start of class, the Charlottesville airport recorded the following readings: pressure = 30.03 inches of mercury (or 1017.0 mb); temperature = 69.1°F; dew point temperature = 61.0°F (which converts to a vapor pressure of 18.2 mb). Calculate the absolute humidity, specific humidity, mixing ratio, and relative humidity. (Note: you may calculate the saturation vapor pressure or look it up using the appropriate table or graph. For all other values, you must show your work to get full credit.)
Explanation / Answer
answer- pressure - 1017mb
temperature - 69.1F = 20.6C = 293.76K
dew point - 61.0 F= 15.5 C = 288.7 K
on converting heat this dew point gives 18.2mb vapor pressure
relative humidty - it is defined as the ratios of partial pressure of water vapor to vapor pressure of air on the surface of the water
from the formula Td = T-((100-RH)/5)
where Td is dew point = 15C , T is temperature of the air= 20.6C and RH is relative humidity
after putting the above value in formula
the relative humidity of above data is about 73%
absolute humidity = it may be defiined as the amount of water content present in air in gm/cm3
the absolute of humidity of above data is 0.013 kg/m3
specific humdity is defined as the amount of water vapor content to total air content
saturation vapor pressure- relative humidty/ vapur pressure = 73/18.2 = 4.01mb
mixing ratio - it is defined as weigth of water vapor per unit weight of dry air
its formula is
w= 622e/p-e
where w is mixing ratios , e for vapor pressure and p is total air pressure
w= 622*18.2/ 1017-18.2 = 622*18.2/998.2 = 11.34
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