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Old February 16, 2019, 01:57 PM   #5
F. Guffey
Senior Member
Join Date: July 18, 2008
Posts: 7,249
When you very rapidly compress air in the presence of anything that is remotely flammable,
Things have changed, there was a time when atmosphere was compressed moisture became visible. Some of the most interesting effects I have seen came off the end of propellers in what looked like a screw effect on humid days.

F. Guffey
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