为什么雪花形成六角结构?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 09 - t21:51:35z //www.hoelymoley.com/feeds/question/446 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/446 47 为什么雪花形成六角结构? Kenshin //www.hoelymoley.com/users/51 2014 - 04 - 23 - t05:25:03z 2020 - 04 - 15 - t06:55:37z < p >雪花形成美丽的六角形结构。下图显示了各种这样的结构是可能的(尽管通过各种方法不是一个详尽的清单):< / p > < p > < img src = " https://i.stack.imgur.com/EHmok.jpg " alt = "在这里输入图像描述" > < / p > < p >雪花形成的机制是什么这些令人愉快的对称的六边形结构?还什么机制在每个不同形状不同的雪花? < / p > //www.hoelymoley.com/questions/446/-/450 # 450 27 回答由tobias47n9e为什么雪花形成六角结构? tobias47n9e //www.hoelymoley.com/users/23 2014 - 04 - 23 - t08:45:38z 2016 - 10 - 11 - t15:12:04z < p > 2 H <子> < /子> O地球上的冰结晶的结构称为“Ice-Ih”这是六角形。依赖于结构的偶极子特性H <子> 2 < /订阅> O-molecules。类似于什么水与离子将他们带入解决方案,晶体结构依赖于积极有利的偶极子的定位。Ice-Ih最有利的定位是一个(或多或少)平面六角环与负偶极子(氧气)面临着向内(或多或少)。邻近环在同一个平面和环在上方和下方平面由氢键在一起(积极的偶极子两个氢原子)。(参见:< a href = " http://www1.lsbu.ac.uk/water/ice1h。html " rel = " nofollow”>六角冰(Ice Ih) < / >)。< / p >

Snow flakes are all different, because crystal growth is very dynamic. While one crystal face grows another one can be susceptible to dissolution. While the snow flake is blown around through the air, temperature and humidity are always changing. This has the additional effect that sometimes crystal nucleation and sometimes crystal growth (which are energetically favourable at different temperatures) are active. While the snow flake descends the same dynamic continues. The crystal competes with liquid water and humidty for H2O-molecules. Even the crystal faces compete with each other leading to for example dissolution of molecules on the inside and crystallization on the outside. Because no snowflake experiences the same conditions in the same history, every one looks a little different (not surprising because actually there are also not two Zircon crystals that look alike, or two flowers that look alike, etc...).

//www.hoelymoley.com/questions/446/-/457 # 457 39 由凯西回答为什么雪花形成六角结构? 凯西 //www.hoelymoley.com/users/64 2014 - 04 - 23 - t14:55:13z 2014 - 04 - 23 - t14:55:13z < p >冰生长在许多形式。中提到的其他的答案,所有的冰我们要遵守< a href = " http://en.wikipedia.org/wiki/Ice_Ih " rel = " noreferrer " >冰Ih < / >,但是还有许多其他的形式。看到这个水的相图:< / p > < p > < img src = " https://i.stack.imgur.com/k9Ths.png " alt =“水的相图”> < br > <子>图片由< a href = " http://commons.wikimedia.org/wiki/User: Cmglee rel = " noreferrer " > Cmglee < / >在< a href = " http://en.wikipedia.org/wiki/File: Phase_diagram_of_water.svg rel = " noreferrer " >维基百科< / > < /订阅> < / p > < p >冰政权生长不同的晶体形状。冰Ih六角晶体生长和在某些制度可以找到三角形和立方冰晶。这个六角形状的水分子中的键角形式变成固体晶格。< / p > < p >这个相图表示我们将体验冰Ih 0 C和-100 C和整个对流层之间的压力。这个冰晶是六角形的,但在这个水晶形式有许多冰晶体生长的习惯。< / p >

ice habits
Image used from Weatherwise magazine, AMS

The axes of this plot are supersaturation with respect to ice ($e/e_{si} > 1$) and temperature. All of of these crystals are hexagonal but some are long skinny hexagonal prisms and some are very thin and wide hexagonal plates. The snowflake is a dendrite and these crystals grow between -10 and -22 C in and supersaturation with respect to liquid water.

What happens is that the hexagonal crystal has 6 vertices connecting its 6 edges. These vertices produce an increased gradient in vapor (indeed, the sharper the angle, the stronger the vapor gradient becomes). At high supersaturations vapor is quickly deposited in the areas of the enhanced vapor gradient and the arms of the dentrite form. The particular shape of the dendrite will depend strongly on the vapor gradient it is experiencing, which in turn is influenced strongly by its current shape and the environment it is growing in.

References:

//www.hoelymoley.com/questions/446/-/460 # 460 19 Neo的回答为什么雪花形成六角结构? Neo //www.hoelymoley.com/users/32 2014 - 04 - 23 - t15:57:19z 2014 - 05 - 21 - t19:47:32z < p >添加到Spießburger和凯西优秀的答案,< a href = " http://en.wikipedia.org/wiki/Hydrogen " rel = " noreferrer " > < / >氢债券的原因有些雪花六面。他提到,但我认为它可以使用更多的外推。< / p >

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www.physicsofmatter.com

The image above shows an oxygen atom bonding with two hydrogen atoms (water). We can call these covalent bonds for our purposes, although hydrogen bonds tend, in some cases (and especially water) have special properties that make it unique from other covalent bonds. The result of this bond is a slightly negative charge near the oxygen atom and slightly positive near the hydrogens.

What happens next is that two water molecules will build up in a specific way, relating to their charge:

www.doublexscience.org

You see, as Spießbürger mentioned, the dipole of the water molecule allows the water molecules to build up in the shape pictured above, over and over and over. This happens naturally, since when water freezes, it forces the molecules to get closer together (but interestingly enough, the end result makes ice less dense than its liquid form). As these molecules build up, you start seeing a crystal lattice:

www.doublexscience.org

With each ring in the crystal lattice having six side. Each point is an oxygen atom. Each side is side is a hydrogen bonding with an oxygen. The snow flake, is just this bonding happening many many times.

So while it might not seem so obvious, we can explain the nature of the hexagonal structure with highschool/middle school level chemistry.

//www.hoelymoley.com/questions/446/-/8824 # 8824 1 答案由孝宏Waki为什么雪花形成六角结构? 孝宏Waki //www.hoelymoley.com/users/5180 2016 - 10 - 05 - t10:44:05z 2016 - 10 - 05 - t10:44:05z < p >当Neo的回答改变方向的一个分子,分子链的移动。这种现象可能会带来像kaleidscope。< / p >

kale

//www.hoelymoley.com/questions/446/-/10322 # 10322 3 Alistair Riddoch的回答为什么雪花形成六角结构? Alistair Riddoch //www.hoelymoley.com/users/809 2017 - 05 - 07 - t03:41:18z 2017 - 05 - 07 - t03:41:18z < p >问的问题是“为什么雪花形成六角结构”。< / p >

I see snowflakes as following the framework of a flattened cuboctahedron.

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