Hot Charcoal in Liquid Oxygen (THERMAL IMAGING) – Periodic Table of Videos

published on July 18, 2020

One of Neal's favorite experiments and mine is dropping red-hot charcoal into liquid oxygen in a cauldron a bowl you've seen it before but now we're going to show it to you like you've never seen it we're going to show you how we do the experiment from the very

Beginning and we're going to show it to with a thermal-imaging camera so you can see which bits get hot which bits get cold and even see some of the temperatures the first thing is that you have to fetch some liquid nitrogen from

The tank it's usually a bit of a tool but when you look at the temperatures it's really quite interesting once Neil did that he had to carried the doers back to his lab where we're going

To make the liquid oxygen now liquid oxygen has a higher boiling point than liquid nitrogen and so you can condense liquid oxygen using liquid nitrogen because it's colder so you begin with a cylinder that's a high pressure bottle

Of oxygen now the pressure of the gas is far too high to use for the experiment so you have to reduce the pressure with a so-called regulator which sits on the top of the cylinder once you've got it flowing you flow it through a coil of

Copper copper conducts heat very well so if you put the coil of copper in the liquid nitrogen and flow the oxygen through it will liquify but because there's a flow it goes right through and doesn't solidify in the coil

So the gas comes out of the cylinder at a low pressure but flowing quite fast it flows down a tube into the copper coil which is cold in the coil it liquefies and when it liquefies the flowing gas blows through probably droplets or slugs

Of liquid out of the other side and then it's fast enough so that it doesn't all boil away when it goes through the last piece of tube and then goes into a thermos flask we didn't have much oxygen and because once it's in the bowl it

Will boil away quite quickly it was important to get the hot charcoal ready first because the charcoal will gently burn in air so once it's hot it will stay hot for quite a long time so Neil heated the charcoal really like lighting

A barbecue now remember we only have one thermos of liquid oxygen and as soon as you pour something cold into the bowl which starts at room temperature a lot of it will boil away so Neil didn't want to waste the oxygen so he cooled the

Bowl pre cooled it with liquid nitrogen because he has far more liquid nitrogen oxygen the bowls made of metal so it cools quite quickly because it doesn't have a

Very high heat capacity once the bowl is cold when he pulls in the liquid oxygen it will still boil a little bit but it won't boil very violently so we won't waste much so in

Goes the liquid oxygen into the pre cooled metal bowl near was ready he had to contain it with several pieces of hot charcoal now obviously when you drop them in you have

Charcoal which is carbon which is going to burn really brightly in the presence of oxygen when it's dropped in the ordinary video camera completely whites out looks really good looks as if the whole world has ended but the

Thermal-imaging camera looks very much more selective wavelengths so you can actually see what's happening to the piece of charcoal not only can you see but you can measure its temperature so you have two really

Good bits of scientific information there was a really interesting thing that happened one of the pieces that Neel dropped in went the usual flash of light nobody knew what was happening but

Brady who was looking through the thermal-imaging camera said it's broken into and then when things had subsided what has happened you could see in fact two pieces of charcoal it's important to stress the liquid oxygen is very cold

The charcoal is very hot it's somewhere between nine hundred and a thousand degrees centigrade and so the way that these two can coexist something that's very hot and something that's very cold is that the charcoal is probably

Surrounded by a bubble of gas now you can't see that hot gas because it's probably not radiating in the same way as the charcoal but you do need to remember you can't have a liquid at minus nearly 200 degrees centigrade in

Contact with the surface that's at a thousand degree centigrade so the charcoal is surrounded by a cushion of air it said it's round so it's more like a bubble and that's important because of course the oxygen gas gets much more

Efficiently to the surface to maintain the burning eventually the reaction slows down and the oxygen rushes in and cools down the remaining fragments of charcoal so probably when Neil washed it out

We found some small pieces of charcoal at bottom looks calm we thank Google's making and science initiative for helping us make this video if you want more information

About the initiative look down in the video description

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