deltaH
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What's this weird blue-white flash in the middle of a dry ice water bottle explosion
I was watching this slow motion video of dry ice in water bottle explosions:
https://www.youtube.com/watch?v=t6X0HTOKC24
and was wondering what cause the blue-white fog in the centre for a split second when it blows. I've included a still of the moment this appears for
clarity:
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phlogiston
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It appears related to a pressure wave that reflects of the remains of the casing. Possibly, it triggers nucleation/condensation of water vapor or
CO<sub>2</sub>.
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"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
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careysub
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It is simply the CO2 "smoke" (dense water vapor fog) that filled the bottle's air space before it burst.
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deltaH
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It forms from the outside-in as phlogiston points out, moments after the explosion. It also disappears a tiny fraction of a
second later.
[Edited on 7-1-2015 by deltaH]
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careysub
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Quote: Originally posted by deltaH  | It forms from the outside-in as phlogiston points out, moments after the explosion. It also disappears a tiny fraction of a
second later.
[Edited on 7-1-2015 by deltaH] |
Oh, I see. In the earlier test you can see smoke filling the bottle before the burst.
What you are seeing in the slo-mo is the Wilson cloud chamber effect, sudden drop in pressure causing momentary cloud condensation. (Also seen behind
the shock wave of large explosions in humid atmospheres).
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deltaH
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| Quote: Originally posted by careysub | | Quote: Originally posted by deltaH | It forms from the outside-in as phlogiston points out, moments after the explosion. It also disappears a tiny fraction of a
second later.
[Edited on 7-1-2015 by deltaH] |
Oh, I see. In the earlier test you can see smoke filling the bottle before the burst.
What you are seeing in the slo-mo is the Wilson cloud chamber effect, sudden drop in pressure causing momentary cloud condensation. (Also seen behind
the shock wave of large explosions in humid atmospheres). |
This sounds about right, I think this is also what Phlogiston was referring to. Thanks both.
[Edited on 7-1-2015 by deltaH]
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