today, i'm going to show you how to make dryice. now, dry ice is a solid form of carbon dioxide. to do this today, we're going touse a carbon dioxide fire extinguisher and we're going to use a material bank that i'vemade and we're going to have some safety equipment, some gloves, and we've got some water to showyou what dry ice is. dry ice is the solid form of carbon dioxide;carbon dioxide is one of the gases in the air, to make it solid, you have to reduceits temperature to -78 degrees celsius. and an easy way to do this is to use a carbondioxide fire extinguisher and as the gas comes out of the fire extinguisher, it cools downbecause there is a high pressure inside and it reduces its temperature. so, first of all,to do this, we're going to need a bank to
collect the carbon dioxide in, so i'm goingto attach this on to the fire extinguisher so that carbon dioxide can escape out of it,but then it will still collect some dry ice, some solid carbon dioxide, that's why i'mgoing to do like that. i'm going to make sure that my hands are protectedby wearing some leather gloves like that. and fire extinguisher works really easily,all you do is just take the pin out, press the button and out comes carbon dioxide. soi'm going to do that now so that's going to make a noise, like i said, something solidin there, and i take it off. inside, we have some dry ice, just like that,it's very cold -78 degrees so i'm not going to touch it with my hands but i've got mygloves on. if you put it in water, water is
at 20 degrees c; if we put it in, there ishuge difference in temperature. so, what it does is it heats the water, this stuff upreally fast and off come lots of bubbles, the carbon dioxide comes out, we see lotsof them, lots of bubbles coming out. also, carbon dioxide is so cold it will freezethings like this eraser here which is a nice eraser. let's put it in there for a bit; itwill get very cold and it will be solid and it will make a kind of solid noise when iwhack it on the table. so i'll get some more. you can see this now; carbon dioxide has startedto come off, okay. and you can see carbon dioxide is a gas and, okay, this is carbondioxide coming off here and it's actually heavier than air carbon dioxide is. so, youcan actually pour it like i said so it's a
gas you can pour and it's going from the solidto the gaseous form there, so i put some more in there. and also, that, i mean, we can get a goodeffect by putting dry ice in some water. with some fairly liquid in it and it will makelots of smoke and bubbles, this is coming out now. i see if i can find this thing thatshould be quite cold now. so, you can see it's frozen now, that's nowat -78 degrees c. so that's what we've done, we've made, carbon dioxides, solid carbondioxide to dry ice, and we've made it quite simply with just a fire extinguisher. andthat's how you make dry ice. .