Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: [Phys-l] Fwd: Full (sic) Moon - Thursday, November 13, 2008



I forgot the Phys-L server strips attachments. I couldn't find the original, but here are more:

http://www.youtube.com/watch?v=HlXfaOFgkd4

bc


On 2008, Nov 12, , at 21:18, Bernard Cleyet wrote:

A friend sent this, forwarded by another friend.

bc



Begin forwarded message:



November 13, 2008

Frosty Moon

Some of the stranger ice formations you're likely to find in the woods are called "frost flowers" or "feather frost."
A typical example looks like a small puff-ball of cotton candy, a few inches across, made up of clusters of thin, curved ice filaments.

Frost flowers usually grow on a piece of water-logged wood, as shown in the above picture (taken by Nick Page; provided by Alan Rempel).
It's something of a rare find, meaning that conditions have to be just so before it will form.

Not much has been written on this unusual phenomenon, and to my knowledge it has never been reproduced in a controlled laboratory environment. It appears that the ice filaments are essentially pushed out from pores in the wood as they freeze.

It's something of a misnomer to call this frost, by the way, since it freezes from liquid water, not water vapor.

Kenneth G. Libbrecht, Caltech
www.SnowCrystals.com



Moon Mails
A monthly eNewsletter dedicated to the Full Moon. Content ranges from the scientific to the poetic.
Information and sources are not verified. You’re on the list because you requested it, or we
thought you might enjoy it. To unsubscribe, hit Reply.