Archived posting to the Leica Users Group, 2019/12/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks, Brian.? I can remember, 80 yrs or so ago, when glass milk bottles froze on the front porch after delivery, leaving the cardboard cap resting on a column of frozen milk, but that action was constrained by the tapered glass bottle.? I had never thought about it happening in free form. Here is a photo of the melting icicle. http://www.gallery.leica-users.org/v/OldNick/20191219-PC190730.JPG.html On 12/19/19 1:17 PM, Brian Reid wrote: > When water freezes, it expands. This is why if you freeze a canned or > bottled beverage, the container will rupture. > > The water on the surface of the birdbath froze in a thin sheet, and > then as it continued to freeze deeper, the newly-formed ice had to go > somewhere. It went up. > > Road asphalt expands when it gets hot; you've probably seen roads > buckled from the heat, like these: > > https://media2.kobi5.com/wp-content/uploads/2019/06/seattle-road.jpg?x18239 > > > > https://cdn20.patchcdn.com/users/22909805/20170417/031832/styles/T600x450/public/article_images/screen_shot_2017-04-17_at_31741_pm-1492456689-3250.jpg > > > > or with a nod to Ric Carter, like these railroad tracks: > https://toolkit.climate.gov/sites/default/files/styles/large/public/BuckledRail.jpg?itok=n8yTM6rZ > > > > Same principle. Expanding asphalt or rails must go somewhere. > Likewise, expanding ice has to go somewhere. > > > On 2019-12-19 9:37 am, Jim Nichols wrote: >> Last night the temperature got down into the 20s F.? This morning, I >> glanced out at a bird bath that stands in a clear area of the yard, >> with nothing above it.? The water in the bird bath appeared frozen, as >> I would expect, but a clear icicle was standing about eight inches >> tall. >> >> What caused this? >> >> http://www.gallery.leica-users.org/v/OldNick/20191219-DSCF1538.JPG.html >> >> http://www.gallery.leica-users.org/v/OldNick/20191219-DSCF1539.JPG.html >> >> I'm sure someone must have the answer. > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- Jim Nichols Tullahoma, TN USA