B) Relative and Absolute Humidity Remember that relative humidity can be describ
ID: 113353 • Letter: B
Question
B) Relative and Absolute Humidity Remember that relative humidity can be described as the amount of water in a parcel of air (vapor pressure) relative to the amount of water that parcel of air can hold (saturated vapor pressure), which varies with temperature (A). Relative humidity (RH) can be calculated directly from; RH = 4x100 where ea vapor pressure of air (mb) and es saturated vapor pressure (mb). Note that the same equation can be rearranged so that; RH e, =box 100 and d 100 RH Complete the empty boxes in the table below. Use the graph in A to determine es and the existing data and equations above to calculate ea or RH. Once completed, answer the questions below Tair (°C) -25 16 32 32 | es (mb) | ea (mb) 0.5 | RH(%) Location Antarctic ice-sheet San Francisco in summer Phoenix AR in summer Amazon Basin 100 12.5 38.9Explanation / Answer
Relative humidity= ea/es *100
For Antartic ice sheet
Given: Tair( degree celsius)=-25 degree celsius
es(mb)=?
ea(mb)=0.5
RH(%)=?
First we need to calculate es( saturated vapour pressure)
Formula for calculating saturated vapour pressure Es=6.11*10*7.5*Tc)/237.7+Tc)
es=6.11*10*(7.5*(-25)/237.7+(-25)
es=61.1*(-187.5)/(212.7)
es=61.1*0.88
es=53.76 mb
Now RH%=ea/es*100
RH%=0.5/ 53.76*100
RH=0.93%
San Francisco in summer
Given Tc=16 degree celsius
RH %=100
es=?
ea=?
es=6.11*10*(7.5*(16)/237.7+16)
es=61.1*120/253.7
es=61.1*0.47
es=28.7
Now ea=RH/100*es
ea=100/100*28.7
ea=28.7 mb
Phoneix AR in summer
Given: Tair( degree celsius)=32
ea=12.5 mb
es=?
es=6.11*10*(7.5*32)/237.7+32)
es=61.1*(240/269.7)
es=61.1*0.88
es=53.76
Now RH%=ea/es*100
RH%=12.5/53.76*100
RH%=23.35
For Amazon Basin
Given: Tair( degree celsius)=32
ea(mb)=38.9
es(mb)=?
RH%=?
es=6.11*10*(7.5*32/237.7+32)
es=61.1*(240/269.7)
es=61.1*0.88
es=53.7
Now RH%=ea/es*100
RH%=38.9/53.7*100
RH%=0.72*100
RH%=72.4
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