Hey Nice, you have found it out yourself, I didn't know this too but I did some googling and found the following information from this site:
http://archive.amol.org.au/recollect...f/humidity.pdf.
"Relative humidity is a measure of the amount of water-vapour contained in air at a
particular temperature. It is basically a comparison between:
•the amount of water-vapour held in the air at any one time and at a particular temperature; and
•the total amount of water-vapour which the air can hold at the same temperature, that is,
the amount of water which will saturate the air at that temperature.
Relative humidity is expressed as a percentage.
This can be written as an equation:
RH = water-vapour present in the air x 100%
water-vapour required to saturate air at that temperature
As the temperature of air increases, its capacity to contain water-vapour increases. For example:
•At 0ºC the air can hold about 6 grams of waterfor each cubic metre of air, that is, 6g/m
•At 10ºC this increases to 10g/m3
•At 20ºC it increases to 17g/m3
•And at 30ºC it increases to 30g/m3
So, if air at 20ºC contains 8.5g/m3
of water-vapour:
RH = 8.5 x100%
17= 50% "
So there you go, the answer is that the RH has changed when you cooled the air because the temperature went down and so the water holding capacity of cold air went down!
Where did it go? My guess is that the excess water that the air can't hold has pricipitated into dew (water droplets).
Now we know and knowing is half the battle! I'm glad that you made me check it out.
