Figure 3.2 shows the variation in relative humidity (blue curve), air temperatur

Question

Figure 3.2 shows the variation in relative humidity (blue curve), air temperature (red curve), and dew-point temperature (green curve) during a 24-hour period at Williamsport, Pennsylvania (“IPT”) in June 2007. Explain why the graph of relative humidity changes so dramatically even though the amount of water vapor in the air (as represented by the dew point) changes so little.

WILLIAMSPORT, PA (IPT) 2254Z 25 Jun 2007 to 2254Z 26 Jun 2007 95 100 80 RELH -60 TMPF 90- 85- 75- 70- 65- 0 -20 TMPF WSYM 86 84 82 77 74 71 69 69 67 66 65 65 67 69 75 78 83 87 90 92 92 92 94 92 90 00 00 oo o oo

Explanation / Answer

Relative humidity is a ratio of actual amount of water vapour (content) in the air compared to the maximum water vapour the air is able to hold (capacity) at that temperature. It is expressed in percentage. How much of water content in the air is not possible to find out by relative humidity, but it gives the information about water saturation content of air, i.e for exmple Rh is 100% the air is said to be fully saturated. The RH is depends inversily on air temperature ,i.e an increase temperature cause decrease in humidity and vice versa.
So above the picture little change in water vapoure cause dramatic change is humidity because of the temperature chenges causes changes in humidity

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