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Fire in low pressure pure oxygen (Patreon)

Published:
2021-03-07 00:57:07
Imported:
2021-10

Content

A redo of an old project. Feedback welcome.

Files

low pressure pure oxygen fire

Help me make videos by donating here: https://www.patreon.com/CodysLab Follow me on Facebook: https://www.facebook.com/codydonreeder SubReddit: https://www.reddit.com/r/codyslab/ Twitter: https://twitter.com/CodysLab

Comments

Anonymous

i would have liked to see different atmospheres of planets represented in the experiment, try to see what a candle would look like on mars or venus or something.

Anonymous

Another informative video. By the way, What’s up with the pressure gauge? There is a line that goes across the upper half of it? Is it a crack or it seems to be filled with something?

Anonymous

This makes me want to see more combustion in pure oxygen, perhaps at higher pressures.

Anonymous

I think Argon is a little more inert than Nitrogen. I think the burning did look a bit more active with Argon but it certainly did go in a similar direction. It might be good to elaborate a bit. (Inert vs Nobel gas) So interesting!! Loved it!

Anonymous

The main effect the inert gas has is to lower the flame temperature, the same amount of reaction has to heat the inert gas as well as the combustion byproducts. Ar is monatomic, so it's got a lower heat capacity (about 3/5ths as much), so the same O2/Ar mix will have a higher flame temperature than O2/N2. 5 O2 / 15 N2 should be about the same as 5 O2 / 25 Ar if I just did the math right.

Anonymous

I wonder if the density of the innert gas has an effect? Like, helium vs. Something heavier?

Anonymous

Interesting especially with reduce pressure and oxygen I really liked it. Thanks Cody.

Anonymous

Is it sort due to Boyles law reduced pressure and increased volume?

Anonymous

Great video! Feedback: at 0:35, you say "If you're not interested, you can skip to" and then "for those who are still here", but there's nothing in between, I think you forgot to cut something?

Martin Sona
>>55091301

and I think shortly before or after that there was a good place to cut to the old video, looked like it was intentional but you forgot to cut in the old footage.

Martin Sona
>>55083882

Yeah I also thought the burning looked more vigorous in the Oxgen/Argon mixture. The explanation makes sense. And if you look at the pure numbers of time from ignition to extinction it also would look like it's backed up very clearly... air: 23 sec (3:24-3:47), low-pressure oxygen: 13 sec (6:57-7:10), 3" oxygen: 15 sec (8:21-8:36), 5" oxygen & argon:14 sec (10:40-10:54)... I'd really like to see that addressed in a follow-up video. I think this video is good as it is, but it would be a great follow-up video.

Anonymous

Very interesting video, LOVE IT!

Ken Barlow

Fun raw science demonstration. Does the pressure change during the candle burning in O2?

Andreas Nohl

What is with normal air and more pressure? I'm dumb I can not find the idea how to calculate the presure in a 1km deep mine. That is not linear but what is it?

CodysLab
>>55109049

Yes, pressure increases exponentially with decreased altitude. On earth it goes up by a factor of e (2.718...) for every 8.5km. Temperature being a factor that will change that. Here’s some further reading: https://en.m.wikipedia.org/wiki/Scale_height

Anonymous

Could you try to burn plants in an oxygen rich atmosphere, like the 35% of the carboniferous 300 million years ago? I could imagine there were a lot of forest fires at the time...

Mike Hanley

Brass wire would probably be acceptable too for your electrodes. Also i'm hoping your setup is ll clean and free from anything flammable (apart from your paper). Also watch out when opening your bottle valve against the shut isolation valve, heat of compression could start your pipes burning if they are not good materials.

Anonymous

Love it! Weird cut to black at ~20s. I don't think you need the skip time reference in the video just after that too. I think the comment above about "atmospheres on other planets" is a good hook to get folk interested.

Anonymous
>>55085364

Sorta. Helium's lower mass means that at a given temperature, it moves faster, so it has a much higher thermal conductivity, which might mean that the paper catches fire quicker (gets heated by the flame front faster).