I can be outside and standing downwind and still have this happen
https://youtu.be/_4ezPvzKe5M?list=PL...B7B05670F&t=80
Ah.
Of course that would happen if I stood downwind.
I meant upwind!
Yeeeeeeeeeeeah, I think I found yer problem right 'ere, mate......
Jeez..... OK, everyone bring yer rigs round to my house. I'll dust 'em out for you and teach you bunch of plums how it's done......
Somebody pick up some milk on the way, though - I'm gonna need extra for all the cups of tea!
A couple have people have basically said this already, but 'compressed air' is NOT COMPRESSED AIR. The most common ones you get now use some sort of hydrocarbon propellant e.g. butane/propane, much like a can of deodorant or pretty much any other common aerosol, with a few exceptions.
Of course, that sort is flammable and will warn you as such on the can. The other, less common, less-flammable type usually use some form of HFC propellant, basically the same group of substances used as refrigerants in air con etc.
Whatever they use, it needs to be compressible into a liquid at a pressure manageable by a cheap can at room temperature - that ain't happening with air. So the liquid that escapes is just the propellant that's been forced out, usually due to inverting the can or something, and it will boil off exactly as it does inside the can, to form the gas. Hence why the can also cools down if you use it a lot. Potential concerns with that are it will cool down whatever it's on which could be an issue e.g. frostbite/thermal shock if there's enough of it, and the fact a flammable one will be, well flammable.
wilko (23-11-2018)
Catch your green fingered neighbour with his leaf blower in the garden and ask him for a quick @#$% job. Hehe
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