科普一下雪花小常识

来源: 2022-01-14 17:34:40 [] [旧帖] [给我悄悄话] 本文已被阅读: 次 (4410 bytes)
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What's Wrong With This Snowflake?

 

During the holiday season we see images of lots of stuff not found in nature: flying reindeer, sugarplum fairies, and geometrically incorrect snowflakes. Now, Thomas Koop, a chemist, is trying to fix the snowflake problem.

 

Koop thinks ice crystals are masterpieces of natural beauty. Unfortunately, he says, "This beauty is sometimes corrupted."

 

Especially at this time of year, when a blizzard of artistically rendered snowflake images sweeps through advertisements and store displays and greeting cards. Koop, who is a professor at Bielefeld University in Germany, says the problem is that many of these images show ice crystals with five sides, or eight sides. In other words, he says, they are scientific abominations.

 

"Since I'm a chemist I know what the crystal structure of ice typically is and therefore I know that there's no way of having pentagonal or octagonal ice crystals and therefore such snow crystals shouldn't exist in nature and they don't," says Koop.

 

Snowflakes can assemble ice crystals into all kinds of complex shapes. But the crystals themselves will usually have six sides.

 

 

"The reason is because the molecular building blocks are water molecules. So there is only a certain way they can fit together and what comes out is that they are always in a six-cornered shape, even at the tiniest molecular scale," he says.

 

Actually, water molecules occasionally form ice crystals with three or 12 sides — either half or double the usual number — but never five or eight.

 

(NPR.com)

所有跟帖: 

LinMu的诗是七瓣:) -妖妖灵- 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 妖妖灵 的个人群组 (0 bytes) () 01/14/2022 postreply 17:44:22

所以要科普,要不被诗人带歪了 :)) -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 17:45:37

我想他是要表达一种很难甚至觉得不可能实现的奢望,就像太阳从西边出来的。。。。。 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 01/14/2022 postreply 17:57:43

理解诗人可言所欲言 :)) -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 18:04:05

花帅还是来译古诗吧,只有钱塘潮,没有七瓣雪:)) -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 18:06:13

对,是一种超现实的浪漫的愿望:) -妖妖灵- 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 妖妖灵 的个人群组 (0 bytes) () 01/14/2022 postreply 18:08:40

诗人可乱说,医生不可以 :) -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 18:11:15

人命关天 :) -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 18:11:45

My friend took photos of snow flakes. -CLary- 给 CLary 发送悄悄话 CLary 的个人群组 (88 bytes) () 01/14/2022 postreply 18:52:52

Another one -CLary- 给 CLary 发送悄悄话 CLary 的个人群组 (88 bytes) () 01/14/2022 postreply 18:53:33

那个完整的象是印在衣服上的 -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 18:58:00

是的,在朋友圈里看到的,很震惊这么清晰 -CLary- 给 CLary 发送悄悄话 CLary 的个人群组 (0 bytes) () 01/14/2022 postreply 19:02:38

It is so perfect that it looks like a fake one:) -妖妖灵- 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 妖妖灵 的个人群组 (0 bytes) () 01/14/2022 postreply 19:01:40

Yes, too vivid to be true:) -CLary- 给 CLary 发送悄悄话 CLary 的个人群组 (0 bytes) () 01/14/2022 postreply 19:03:17

Art from above and beyond , 雪花??照的接近移花照的。 -AP33912- 给 AP33912 发送悄悄话 AP33912 的博客首页 AP33912 的个人群组 (0 bytes) () 01/15/2022 postreply 06:42:00

嗯,新鲜出炉的雪花:) -CLary- 给 CLary 发送悄悄话 CLary 的个人群组 (0 bytes) () 01/15/2022 postreply 07:22:02

so delicate -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/14/2022 postreply 18:56:35

左边有一个象 束或東 字 -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 移花接木 的个人群组 (0 bytes) () 01/14/2022 postreply 19:34:43

是有点像, -CLary- 给 CLary 发送悄悄话 CLary 的个人群组 (0 bytes) () 01/14/2022 postreply 19:45:38

恭喜善念。首页进来,谢谢网管,科普一下雪花小常识 推荐成功 -梅雨潭- 给 梅雨潭 发送悄悄话 梅雨潭 的个人群组 (0 bytes) () 01/15/2022 postreply 16:45:24

谢谢谢谢! -心存善念- 给 心存善念 发送悄悄话 心存善念 的个人群组 (0 bytes) () 01/15/2022 postreply 20:52:51

雪花可能不是纯化合物 -Zhuzitaba- 给 Zhuzitaba 发送悄悄话 Zhuzitaba 的博客首页 Zhuzitaba 的个人群组 (530 bytes) () 01/15/2022 postreply 19:46:19

我每年都照雪花 -chaoshou- 给 chaoshou 发送悄悄话 chaoshou 的博客首页 chaoshou 的个人群组 (2843 bytes) () 01/16/2022 postreply 06:52:08

欢迎chaoshou来美坛玩!哇,冰清玉洁的雪花,breathtaking!欢迎加一些英文发主帖,让更多人看到! -妖妖灵- 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 妖妖灵 的个人群组 (0 bytes) () 01/16/2022 postreply 15:25:41

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