It's quite simple. Water vapor - H2O molecules in a gaseous state - are what causes light to scatter. The colder the air, the less water vapor it can contain. Therefore there is less scattering of light resulting in a clearer view.

At 01:02 PM 12/3/2002 -0500, you wrote:
It was about 9 degrees Fahrenheit this morning and very clear out. It seems it is usually or often clear when very cold. Dumb question but is this some kind of rule: is it always/usually clearer when cold? And why? Is it because of the cold, or some other related factor which may be present when it is not cold or may sometimes not be present when it is cold)? Or is it all in my imagination? Thanks and forgive my ignorance...


Gary J Sibio
[EMAIL PROTECTED]
http://home.earthlink.net/~garysibio/

Time flies like an arrow.
Fruit flies like bananas.

Reply via email to