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Topic: Pressure experiment  (Read 2249 times)

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Offline kapital

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Pressure experiment
« on: January 05, 2016, 06:22:44 PM »
Can somebody please explain me what is the mechanism for the experiment in the link. From what I see I would say that the amount of gas compounds should be larger not smaller, and positive pressure should be formed, not lower, which seems to be the case. I don't see other explanations. Thanx for answers. http://www.dailymotion.com/video/x1cliq4_cool-physics-experiment-flying-glasses-sick-science-underinflation-with-fire_people
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Offline mikasaur

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Re: Pressure experiment
« Reply #1 on: January 05, 2016, 06:28:54 PM »
[itex]P = \frac{nRT}{V}[/itex]

What happens to P when you hold n and V constant but you reduce T (by extinguishing the flame)?
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Offline kapital

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Re: Pressure experiment
« Reply #2 on: January 05, 2016, 06:41:35 PM »
Pressure goes down, obviously, but why temperature goes down?
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Offline mikasaur

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Re: Pressure experiment
« Reply #3 on: January 05, 2016, 06:58:15 PM »
The temperature drops because the flame is extinguished.
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