Gas Things

Boom! The classic potato gun harnesses the combustion of flammable vapor.
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LucyInTheSky
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Heres a site comparing different gases, I have nothing else to say so enjoy.

http://www.bernzomatic.com/bernzomatic/ ... sons.jhtml
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Deko
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thats pretty sweet thanks for that site :D
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Bluetooth
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Wow! Acetylene requires very little oxygen.
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squeaks
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Well, this is kinda usefull except that it tells us everything that we already knew-butane is weaker than propane which is weaker than mapp which is weaker than acetylene. It would be interesting to get some comparisons like this on different gases though. Nice find.
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Bluetooth
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It's still useful though.
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mark.f
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I'd like to see the same chart with these included as well:

Propylene
Ethylene
Propadiene
Isopropyl alcohol, (properly vaporized)

and many others.
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benstern
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How the hell did they find out the vapor pressure of acetylene to be 250 psi?
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beebs111
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although the flame temp is hotter by 400 degrees, the burning velocity of propane is much higher, thus it burns faster blah blah blah
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boilingleadbath
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...I figured you guys would compare them.

Butane:
C4H10 + 6.5 O2 -> 4 CO2 + 5 H2O
(7.5 -> 9)
With a flame temperature of 3200*F, this gives us a flame pressure of 7.1 times the inital pressure.

Propane:
C3H8 + 5 O2 -> 3 CO2 + 4 H2O
(6 -> 7)
With flame temperature of 3450*F, this gives us a flame pressure of 7.3x.

That's a difference of less than 3 psi in a typical combustion cannon.
Practicaly the same, if you ask me.
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