编辑“︁雪花”︁

{{other uses|雪花 (消歧义)}}
[[File:ComputerHotline_-_Snow_crystals_(by).jpg|缩略图|刚落下的雪花]]
[[File:Snowflake_macro_photography_1.jpg|缩略图|天然雪花的微距摄影]]
[[File:SnowflakesWilsonBentley.jpg|thumb|不同形狀的雪花]]
[[File:SnowflakesOnWindshield.JPG|thumb|片片雪花]]
[[File:SnowflakeOnJacket.JPG|thumb|外套上的雪花]]
'''雪花'''是[[雲]]內形成的一種[[冰晶]]，當冰晶質量足夠大，并与其他冰晶混合後，就會落入[[地球大气层]]<ref name="Knights">Knight, C.; Knight, N. (1973). Snow crystals. Scientific American, vol. 228, no. 1, pp. 100–107.</ref><ref name="Hobbs">Hobbs, P.V. 1974. Ice Physics. Oxford: Clarendon Press.</ref><ref name="frisbees">{{Cite news|url=https://www.nytimes.com/2007/03/20/science/20snow.html|title=Giant Snowflakes as Big as Frisbees? Could Be|work=[[The New York Times]]|first=William J.|author=Broad|date=2007-03-20|accessdate=2009-07-12|archiveurl=https://web.archive.org/web/20111104033402/http://www.nytimes.com/2007/03/20/science/20snow.html|archivedate=2011-11-04}}</ref>。当雪花進入不同溫度和濕度的大气層時，就会出现复杂的形状，因此從细节上看每片雪花都不相同，但雪花仍然謹守著最初的冰晶基本的[[六角形]]對稱標準結構，透過顯微鏡可以看見雪花錯綜複雜的構造大多都是六角形的，而雪花的中心一定呈現出[[六方晶系|對稱的六角形]]<ref>[http://news.xinhuanet.com/forum/2005-01/30/content_2519823.htm 显微镜下的雪花真漂亮] {{webarchive|url=https://web.archive.org/web/20161220074642/http://news.xinhuanet.com/forum/2005-01/30/content_2519823.htm |date=2016-12-20 }}</ref>。此外雪花形狀上可以分为八大类。雪花的形状主要有针状、柱状、板状，也可以相互組合。由于雪花的晶体面會对光進行[[漫反射]]，所以導致雪的顏色看起来是白色的<ref name="LawsonCh5">{{Cite book|chapterurl=https://books.google.com/books?id=4T-aXFsMhAgC&pg=PA39|title=Chapter 5: The Colors of Light|page=39|first=Jennifer E.|last=Lawson|isbn=978-1-894110-63-1|year=2001|accessdate=2009-06-28|publisher=Portage & Main Press|archiveurl=https://web.archive.org/web/20140101063949/http://books.google.com/books?id=4T-aXFsMhAgC&pg=PA39&lpg=PA39|archivedate=2014-01-01}}</ref>。

{{link-en|威爾遜·班特利|Wilson Bentley}}是第一位的雪花拍攝者。<ref>{{cite web |url=http://www.digitaljournal.com/article/263168 |title=No two snowflakes are alike |date=2008-12-07 |author=Chris V. Thangham |accessdate=2009-07-14 |publisher=Digital Journal |archive-date=2009-12-28 |archive-url=https://web.archive.org/web/20091228011231/http://www.digitaljournal.com/article/263168 }}</ref>[[开普勒]]曾寫過一本研究雪花結構的書，叫《六角的雪花》（De Nive Sexangula）。<ref>{{cite book |last1= Kepler |first1=Johannes |authorlink1= Johannes Kepler |title= De nive sexangula |trans_title= The Six-sided Snowflake |url= |year= 1966 |origyear= 1611 |publisher= Clarendon Press |location= Oxford |isbn= |oclc=974730 }}</ref>[[科赫曲線]]形狀很像雪花。

{{Gallery
|title=电子显微镜下的雪花
|footer=
|align=center
|width=140
|height=120
|lines=2
|File:Snow crystals.jpg|
|File:Snow crystals 2b.jpg|
|File:LT-SEM snow crystals.jpg|
|File:LT-SEM snow crystal magnification series-3.jpg|
|File:Snowflake 300um LTSEM.jpg|
|File:Snowflake 300um LTSEM, 13368.jpg|
|File:Tsuzumi snow crystal.jpg|形狀像沙漏的[[雪晶]]
}}
==参考文献==
{{reflist}}

[[Category:雪]]
[[Category:降水]]