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this is a cabbage you got at Trader

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Joe's it's organic cabbage and I'm going

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to take out off one of the outer leaves

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that and we're going to use this for a

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little experiment this cabbage is

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largely water it's green vegetable and

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so it's crunchy because it's got lots of

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water and it is quite as strong

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vegetable on the end leaves as well so

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if I just put it in the fire and take it

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away nothing's going to happen because

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the so much water content in there

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always happening is it's just warming up

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the water a little bit I can leave it on

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a little bit longer it's kind of getting

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a little bit almost hot now you could

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leave it on long enough what will happen

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is the water inside the cabbage world

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will evaporate and you can kind of see

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the water starting to burp anyway if I

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move it closer to the camera you'll

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probably see a little little steam

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rising of it let's leave it long enough

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so the water in the leaf is actually

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boiling takes quite a long time okay I

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see you see steam is rising from it now

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and eventually what's going to happen is

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that so much of the water will be

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removed from the cabbage leaf that it is

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going to be so dry that it will be able

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to catch fire and that's happening

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around the edges of the leaf here but

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you can see there's still a really large

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amount of water coming off this leaf and

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I'm going to leave it there long enough

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so we can actually get the main part of

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the leaf to burn which is taking quite a

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so you can see the leg is actually

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shrinking away as that's the water had

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removed it feels now it's still a little

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bit damp but it's very very thin and dry

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which is because the waters been removed

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most of the leaf as I said is actually

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water and let's just finally get it

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completely dried out so it is actually

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there we go organic cabbage same at any

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other cabbage so this video to

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demonstrate the effects of water content

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on combustion this is just a sheet of

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paper which I'm going to tear into two

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pieces one piece will be dry and the

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other piece will be wet so I've got two

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pieces I'll just got one piece here for

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now

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away from the flame and the other one

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I'm going to stick in this water and

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then I'll just stick it over here and

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now because I'm going to use this water

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to put out to this one when I light it

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up fire you see if you just take it in

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the flame and it instantly likes on fire

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very straightforward and obvious and the

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nothing happens in fact it's not even

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burnt and stick it on the full flame all

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that's happening is it's heating up the

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water oops that's a little bit of such

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that now if we leave it there long

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enough what's going to happen is that it

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will dry out this portion here which is

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over the flame and you can see it

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getting dry and eventually that will

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catch fire but the rest of it isn't

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going to burn because it's actually wet

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just the dry portion there is burning so

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this portion here is still a little bit

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damp and still doesn't burn so that's

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the same thing that's happening with the

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cabbage experiment is that the water

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content of something is what determines

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whether it burns or not you see I've got

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one half wet and one half dry if I put

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that on the dry path catches fire and