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For the life of me I cannot figure this out...white fog?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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For the life of me I cannot figure this out...white fog?

Unread postAuthor: Coodude26 » Wed Jun 18, 2008 9:34 pm

What is the whitish fog that comes out when you shoot a pneumatic?
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Last edited by Coodude26 on Wed Jun 18, 2008 9:53 pm, edited 1 time in total.
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Unread postAuthor: mopherman » Wed Jun 18, 2008 9:35 pm

The white fog is a water vapor cloud that has condensed in the compressed air.
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Unread postAuthor: pizlo » Wed Jun 18, 2008 9:38 pm

actually its condensed fylotheradoczie dyethylebleblemene. Its extremely Toxic, makes global warming and emits harmful radiation. Watch out man!
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Unread postAuthor: FishBoy » Wed Jun 18, 2008 9:40 pm

pizlo wrote:actually its condensed fylotheradoczie dyethylebleblemene. Its extremely Toxic, makes global warming and emits harmful radiation. Watch out man!

haha, hilarious, i like your sense of humor :lol: :lol:
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Unread postAuthor: Coodude26 » Wed Jun 18, 2008 9:43 pm

Pizlo, I believed you until the word "dyethylebleblemene". Nice.

So on a humid day it will be really dense?
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Unread postAuthor: STHORNE » Wed Jun 18, 2008 9:50 pm

I believe so..

(p.s. - title = whire fog?)
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Unread postAuthor: Coodude26 » Wed Jun 18, 2008 9:52 pm

Woops. Thanks.
(Is this message long enough?)
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Unread postAuthor: STHORNE » Wed Jun 18, 2008 10:00 pm

Coodude26 wrote:(Is this message long enough?)


(for future reference), if your message isn't long enough (or if your like me and can predict whether it will be long enough or not), simply hold down the space bar for a couple seconds after you type your message to fill up a few extra character spaces.

Don't make a habit of it just to get extra spudbux :wink:
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Unread postAuthor: Maniac » Wed Jun 18, 2008 10:18 pm

actually its condensed fylotheradoczie dyethylebleblemene. Its extremely Toxic, makes global warming and emits harmful radiation. Watch out man!


Thats pretty funny it might go in my sig.
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Unread postAuthor: psycix » Thu Jun 19, 2008 4:43 am

When the compressed gas acts out force on the projectile, the projectile gains kinetic energy, and the air loses this energy, but in a thermal way.
When the air loses some of the thermal energy, it becomes cold.
And when air gets cold, the water in it condenses.

You are actually making clouds :D
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Unread postAuthor: jackssmirkingrevenge » Thu Jun 19, 2008 4:59 am

psycix wrote:You are actually making clouds :D


That's going to be the next United Nations aid program then, "Spudguns for Africa" :D
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Re: For the life of me I cannot figure this out...white fog

Unread postAuthor: Ragnarok » Thu Jun 19, 2008 5:30 am

Coodude26 wrote:What is the whitish fog that comes out when you shoot a pneumatic?

Dunno about you, but I get an eight foot long cloud of thick smog, which is seemingly what happens when you rapidly decompress 40 cubic inches of air at over 360 psi.
Can't wait to see what happens when I finally get to 500 psi. :twisted:

And it's always more fun to add a useless message on the end of a post if it's too short than add a run of spaces.

I mean, by the time you realise I have nothing useful to say here, it's too late.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: DYI » Thu Jun 19, 2008 3:01 pm

Dunno about you, but I get an eight foot long cloud of thick smog, which is seemingly what happens when you rapidly decompress 40 cubic inches of air at over 360 psi.
Can't wait to see what happens when I finally get to 500 psi.


The muzzle blasts from the SCTBDC at 500 psi with a 3" barrel were quite impressive to see as well.
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Unread postAuthor: jimmy101 » Fri Jun 20, 2008 1:08 am

When gases expand they cool off. If they cool off enough the moisture in the gases will condense and form a cloud. It doesn't really matter much that energy (heat) was transfered to the ammo, even a dry-fired gun will give a cloud since all the energy in the compressed gases gets transfered someplace else.

The biggest drop in pressure comes just after the ammo exits the barrel. GasEq says that the decompression of 120 PSIG air that started at 80F to zero PSIG gives air at -180F. That's pretty cold.

The cloud can also be from the cold blast of air from the muzzle cooling off the air outside the gun, causing the moisture outside the gun to condense.
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