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Old 10-01-2003, 08:50 PM   #1 (permalink)
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I have a question about FIRE...anyone know the answer???

Hey there...I've always wondered about this question:

Everyone knows that when you go into space that there is zero gravity...stuff floats...even you...now if you take some water and pour it into the space ship with zero gravity then it just floats and wobbles in blobs of water...

Now what if you do the same thing but with fire??? How does fire react to zero gravity??? Does it form little blobs of fireballs??? Now this is supposing that the ship DOES have oxygen cause you can have oxygen and have no gravity...and also fire needs oxygen to live...so what would happen to fire in zero gravity??? THANX
C'YA ?:-D
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Old 10-01-2003, 08:59 PM   #2 (permalink)
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check this (pic at bottom of page): http://science.howstuffworks.com/fire1.htm

pretty cool.
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Old 10-03-2003, 12:10 AM   #3 (permalink)
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everything naturally forms into a sphere in zero gravity
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Old 10-03-2003, 04:27 PM   #4 (permalink)
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everything?
well, lets see, the sphere encompasses the largest volume using the least surface area. Any 'material' where the surface is at higher potential than the bulk should (giving that it's already in a high enough energy state) form a sphere in zero gravity. Although I'm thinking that fire being spherical has less to do w/ potential energy and more to do w/ convection.
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Old 10-03-2003, 05:26 PM   #5 (permalink)
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Most likely the fire would cause the ship to blow up since they use pure oxygen in the space shuttle.
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Old 10-04-2003, 01:19 AM   #6 (permalink)
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Quote:
Originally posted by B21
Most likely the fire would cause the ship to blow up since they use pure oxygen in the space shuttle.
No.

NASA hasn't used pure oxygen since the disasterous Apollo 1 fire that killed three astronauts in their capsule during a training session on Jan 27, 1967.
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Old 10-04-2003, 09:32 AM   #7 (permalink)
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Quote:
Originally posted by Lebell
No.

NASA hasn't used pure oxygen since the disasterous Apollo 1 fire that killed three astronauts in their capsule during a training session on Jan 27, 1967.
Oh i thought they still used it.
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Old 10-04-2003, 10:29 AM   #8 (permalink)
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here is a pic of fire in microgravity, the credit for the pic on the site i got it from was given to NASA

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Old 10-05-2003, 02:30 PM   #9 (permalink)
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Pretty cool. Zero-gravity would be awesome to be in for a couple days
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Old 10-05-2003, 05:10 PM   #10 (permalink)
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i agree, could u imagine sex in zero-gravity?......
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Old 10-05-2003, 09:32 PM   #11 (permalink)
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yea prolly akward
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Old 10-21-2003, 11:17 PM   #12 (permalink)
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As far as I know I would retain my shape
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Old 10-22-2003, 03:17 AM   #13 (permalink)
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Quote:
Originally posted by Lebell
the disasterous Apollo 1 fire that killed three astronauts in their capsule during a training session on Jan 27, 1967.
...which wouldn't have happened either if the American and Soviet space programmes had shared even the smallest amounts of information. The Soviets figured out that you needed to dilute the oxygen to prevent fires long before Apollo I.

The 'natural' shape for a flame plasma is spherical. On Earth, the heat causes a convection current around the flame, causing the familiar tapered shape. In the absence of gravity, the less dense air around the plasma will not move 'up,' so the convection current will not form and the flame will remain spherical.
In the absence of the convection current, the flame will quite quickly use up all of the oxygen nearby, and go out.
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Old 10-22-2003, 10:19 AM   #14 (permalink)
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Quote:
Originally posted by B21
i agree, could u imagine sex in zero-gravity?......
A friend of mine took this one course offered at the University of Maryland.... i forget the name of the course, but one lecture was devoted to reproduction in a zero-grav/space environment. He said it was awesome, the professor talked about a bunch of sex toys they had to use to keep the people from thrusting the other person across the room
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Old 10-23-2003, 12:25 PM   #15 (permalink)
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Quote:
Originally posted by Moskie
A friend of mine took this one course offered at the University of Maryland.... i forget the name of the course, but one lecture was devoted to reproduction in a zero-grav/space environment. He said it was awesome, the professor talked about a bunch of sex toys they had to use to keep the people from thrusting the other person across the room
LOL, what a useless but cool study. What would we possibly need to know about sex is zero grav for? lol
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Old 10-23-2003, 04:40 PM   #16 (permalink)
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"In the absence of the convection current, the flame will quite quickly use up all of the oxygen nearby, and go out."

Actually, not true. That's what everyone thought until they set small fires in an experiment on the space shuttle. They kept burning until the preprogramed extinguisher kicked in. They were planning to do it again without artificially extinguishing it, but then Columbia happened. . .
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Old 10-23-2003, 09:36 PM   #17 (permalink)
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i bet it would look cool to light a ball of lighter fluid on fire... really get the sphere thing going...
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Old 10-23-2003, 09:43 PM   #18 (permalink)
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and the lighter fluid would be in a ball shape too!
then you could throw the flaming ball of fluid at a fellow astronaut and watch him freak out as the malotov minus bottle hits him

or maybe not....
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Old 10-29-2003, 09:32 PM   #19 (permalink)
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Quote:
Originally posted by Metallica_Band
...so what would happen to fire in zero gravity???
Why don't you take a look at that big burny thing. You know. that one in the sky. That might tell you.


Hey it's just a joke relax.
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Old 10-29-2003, 10:10 PM   #20 (permalink)
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Actually, no one is supposed to do this. Any picture you see of it was doctored by propagandists. If this was actually done, the universe would collapse in on itself, and the mighty Space Gerbils would laugh at us.
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Old 10-30-2003, 12:31 AM   #21 (permalink)
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Wouldnt there be no fire?

Cuz you can only have no gravity in a vacuum like thing, where theres no gravity.

I dunno..im confused.

Does it really matter?
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Old 10-31-2003, 05:25 AM   #22 (permalink)
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you can have air without gravity. Ask the astronauts on the space station.
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Old 11-01-2003, 12:09 AM   #23 (permalink)
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Quote:
Originally posted by Doesn't Matter
Wouldnt there be no fire?

Cuz you can only have no gravity in a vacuum like thing, where theres no gravity.

I dunno..im confused.

Does it really matter?
No, there should still be a fire.
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Old 11-19-2003, 11:00 PM   #24 (permalink)
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But isn't fire just a parcel of air that's been heated? You know, the part of it that's so hot that it joins the visible spectrum of colors? I'm not disagreeing that this parcel of air would then turn into a sphere in zero gravity, I'm just having trouble wrapping my brain around the fact that we're talking about fire like it's a substance in and of itself.
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Old 11-24-2003, 08:10 AM   #25 (permalink)
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ok, here's the explanation:


Gravity causes denser (heavier) air to sink below lighter (less dense) air.

Heat is expansionary and will tend to flow from high to low density areas.

Since on earth, under gravity, the low density areas are higher than the high density areas, fire tends to go upwards.

But in zero gravity, the air's equally dense everywhere. Fire doesn't have anywhere to flow to, because there are no areas of lower density, so it stays in its natural state, which is a sphere. If you installed a vaccum generator above the fire (say, a ducted fan that sucks air out of the room the fire's in) (after all, all a fan does is create an area of low pressure into which the air around it flows, which creates the breeze) then the fire will head toward the low pressure area generated by the fan, and will look pretty much like fire on earth. If you stuck the fan below the fire, you'd get upside down fire
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