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Cool ice formations my friend discovered on his deck this morning
- gmiller123456 5y agoIt looks like it might be related to "frost flowers" https://www.weather.gov/lmk/frost_flowers https://www.weather.gov/lmk/frost_flowers
- 40four 5y agoEvery time I see this phenomenon, it still blows my mind. It’s absolutely gorgeous, I’ll never get tired of seeing it!
- WhitneyLand 5y agoIs there any way to reproduce a similar effect as a fun home science experiment? I might’ve guessed something could be fabricated or 3-D printed and thrown in the freezer on a small scale, but I didn’t notice anything in a cursory Google search…
- pksebben 5y agosomewhere in the Twitter comments, there's a link to another hacker news post that shows it's likely trapped water extruding from small holes in the fence structure. drill some holes in a pipe and put it somewhere freezing
- gus_massa 5y agoSomething similar has been discussed in the past "Extruding Ice from Steel Fences and Pipes with Diurnal Freeze/Thaw" http://my.ilstu.edu/~jrcarter/ice/diurnal/extrude/ http://my.ilstu.edu/~jrcarter/ice/diurnal/extrude/ , but most of the links are dead :( :( :( https://news.ycombinator.com/item?id=2089306 https://news.ycombinator.com/item?id=2089306 (148 points | Jan 10, 2011 | 13 comments) https://news.ycombinator.com/item?id=26121775 https://news.ycombinator.com/item?id=26121775 (261 points | 11 months ago | 21 comments) Anyway, from one of the comments I got this video "Extruding Ice From A Steel Pipe- Time Lapse" https://www.youtube.com/watch?v=nbiEfr5FxEA https://www.youtube.com/watch?v=nbiEfr5FxEA
- beambot 5y agoSearch for "ice ribbons" on Google images.
- walrus01 5y agothis is one of the most common causes of damage and failure for low-cost small radio towers (such as a 60' to 80' that a ham radio enthusiast might erect in their yard). Usually because the hollow tubular legs of a triangular lattice tower aren't set into gravel at the bottom of the foundation concrete block, and there's no way for water to drain out. Then you have not only rust issues to be concerned about for corrosion, but also freeze/thaw cycles. Any tower type with hollow legs can see this problem if not installed right. Seen with small Rohn 45G class towers that are put up by amateurs. https://www.rohnnet.com/rohn-45g-tower https://www.rohnnet.com/rohn-45g-tower
- jonnycomputer 5y agoWas coming in to say the same thing. Super cool though.
- _Microft 5y agoInternet archive to the rescue! This is not a particular capture by the way, only one that still had content on the page: https://web.archive.org/web/20190216145020/http://my.ilstu.edu/~jrcarter/ice/diurnal/extrude/ https://web.archive.org/web/20190216145020/http://my.ilstu.e...
- hatware 5y agoA natural, sub-zero, 3D printer. Neat.
- dzhiurgis 5y agoWonder if one could print a massive space telescope lens this way
- deleted 5y ago[deleted]
- engineer_22 5y agoThis is called hoarfrost
- smoldesu 5y agoThat's... phonetically unfortunate.
- CommieBobDole 5y agoI don't think that's correct - hoarfrost is sort of a feathery looking frost that forms from water vapor in the air on cold, clear nights. This looks more like ice created from water freezing inside something and being extruded through cracks or holes.
- CrazyStat 5y agoHoarfrost is ice crystals that grow in place, which is different. This looks to be formed by extrusion.
- drewcoo 5y agoThe spiraling icicles in the photo are not hoarfrost. Wind conditions there must me interesting.
- 0des 5y agoTwitter dislikes VPN users so it is unviewable for me, just endless refreshing
- _Microft 5y agohttps://nitter.net/CJF_NC/status/1490093486330322949 https://nitter.net/CJF_NC/status/1490093486330322949
- autoexec 5y agoThanks, I haven't bothered clicking on any twitter links since they started insisting on everyone allowing javascript. nitter.net seems to solve that problem for me :}
- _Microft 5y agoI am glad I could help! If nitter.net itself is not working, you can pick a mirror from this list: https://github.com/zedeus/nitter/wiki/Instances https://github.com/zedeus/nitter/wiki/Instances
- jonnycomputer 5y agoI read twitter without an account. Twitter tries all kinds of things to get me to log in. Now it blocks too much scrolling on a particular person's tweets.
- cbozeman 5y agoIt's this kind of user-unfriendly design that makes me want to abandon all social media.
- Tistron 5y agoWow, that loads immediately and actually shows the content in a useful way. Thank you!
- cmurf 5y ago
- __MatrixMan__ 5y agoI think it's called ribbon ice. I've always thought it would be cool to have containers that are designed to extrude it so that before a storm comes you could fill them with water and have a transient art thing happen. I think that the temperature requirements are rather specific, so you might also need some kind of temperature control widget to make it happen more reliably.
- hh3k0 5y agoI know them as frost flowers but it seems to be the same thing: https://en.wikipedia.org/wiki/Frost_flower https://en.wikipedia.org/wiki/Frost_flower
- tobr 5y agoThis made me remember a strange phenomenon I noticed a winter day a few years ago. In a park with some trees there was consistently less snow coverage in a line going away from each tree, always in the same westward direction. Basically following a shadow of the tree. Looking around at other objects I also noticed the phenomenon next to some signs and metal poles. What could explain this? I could understand if there were more snow or ice in the shadow, as the ground would be colder there, but why would there be less?
- djrogers 5y agoWind. The trees and other structures shielded the downwind area from snow that doesn’t fall straight down.
- quercusa 5y agoThe trees reflecting afternoon sun?
- sjg007 5y agoIt's probably windy and the snow piles up on the windy side of the tree.
- minitoar 5y agoPossibly less vegetation in shadow of these objects, and therefore less insulation between snow and warmer earth.
- AYBABTME 5y agoProbably prevailing wind conditions.
- Philip-J-Fry 5y agoProbably was snowing gently at some point and then later on it got windy and was blowing west.
- winrid 5y agoIt's like the ice version of tin whiskers.
- buescher 5y agoI think ice extrusion is better understood, but I could be wrong about that. Tin whiskers approach alchemical levels of weirdness, and are not well understood at all. The ones that look like little plants are so strange: https://aimsolder.com/technical-articles/tin-whiskers-revelations-part-iii https://aimsolder.com/technical-articles/tin-whiskers-revela...
- dade_ 5y agoIce jellyfish have been in the news lately, but I prefer this ribbon ice. https://www.pentictonwesternnews.com/community/ice-jellyfish-spotted-around-okanagan-lake/ https://www.pentictonwesternnews.com/community/ice-jellyfish...
- dmckeon 5y agoIn caves, things like this would be called helictites. https://en.wikipedia.org/wiki/Helictite https://en.wikipedia.org/wiki/Helictite
- chmod600 5y agoIt looks like the suggestion of extruding ice (in another comment) seems more plausible than a kind of capillary action as you suggest.
- robocat 5y agoFor it to be extruding ice, the top of the railing would need to be full of water (which seems unlikely), and there need to be multiple holes in the railing of the same cross-section (which also seems unlikely). Because it is snowing an ice cap can form on top of the rail, and if the railing is warmer than freezing (for example if the air is above freezing), then heat can be transferred to the bottom of the ice cap, and water can come out the sides of the ice cap? Edit: leaving a layer of water under the icecap? Although cap would slide off if it were completely liquid under cap? Aside: I saw something similar recently while I was playing with a Himalayan salt block candle holder, placed on a plate, placed on a wood burner. Wetting the outside of the holder with a sprayer causes the salt to dissolve and the brine pools in the plate. As the brine pool dries due to the heat, salt forms an impermeable crust on the pool, and then the brine dries from the edge of the pool. The dried salt slowly extends over the plate, and it then goes over the edge of the plate and the salt dries on the underside of the plate. The heat of the wood burner speeds up the process. I originally saw the process happen to the salt block over months of time while it was sitting on a dish, sitting in an environment that is sometimes humid and sometimes dry. Edit: image https://im.ge/i/XfAm8P https://im.ge/i/XfAm8P
- jwandborg 5y ago> They can be easily crushed or broken by the slightest touch. Because of this, helictites are rarely seen within arm's reach in tourist caves. Wonderful bit of Gitchhiker's Guide to the Galaxy-esque comedy.
- zipotm 5y agoStrange attractors saying "Hello!"
- meetups323 5y agoBut aren't we all?
- JulianMorrison 5y agoLooks similar to the fluffy ice that forms on wood and was recently discovered to be caused by a fungus.
- soheil 5y agoI wonder if the underlying mechanism responsible for forming these ice formations are the same as that of plants and vines. It seems to me the boundary between what we call alive vs not is getting ever blurrier.
- YaBomm 5y agoProbably should drive some drain holes at the bottom of that railing?
- anderspitman 5y agoSorry if this is too OT but does anyone know the name of the phenomenon when a bottle of water in a freezer gets just cold enough that if you shake it a little it instantly turns into slush?
- detaro 5y agohttps://en.wikipedia.org/wiki/Supercooling https://en.wikipedia.org/wiki/Supercooling
- anderspitman 5y agoThat looks like it; thank you!