煙圈

烟圈[1]是指烟雾在大气中形成的人類肉眼可见的涡环。吸烟者可能会有意或无意地从嘴里吹出烟圈[2]。在特殊条件下，一些火山口也会产生巨大的可见的烟圈，例如埃特納火山就會產生煙圈。 [3][4]

火箭筒發射時產生的烟圈
一位男子吐出的烟圈
埃特纳火山產生的烟圈

可以產生煙圈的火山和地點

参考文献
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  2. Jilian Mincer. . Reuters. 1 May 2015.
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  7. . www.volcanodiscovery.com.
  8. Iceland Volcano Blows Spectacular Smoke Ring: Big Pics Discovery News, 2010-05-10.
  9. . The Telegraph. [2021-01-28]. （原始内容存档于March 26, 2010）.
  10. Duyck, Bernard. . Earth of fire.
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  14. . February 21, 2013 –Flickr.
  15. . touch.metrotvnews.com. [17 January 2022]. （原始内容存档于12 September 2014）.
  16. . YouTube. 2015-12-05 [2021-01-28]. （原始内容存档于2021-12-22）.
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