Brought out of the barn a heavy bundle of firewood, dropped it with a crash near the stove. Logs, strong, healthy. Flooded stove. Look through for an hour or two from bundles nothing left, only a handful or two of ash.
Where the bundle was gone?
And what is "burned"?
Let us examine this question. Here is the candle, when lit, disappears. What is she completely disappears or is it only seems?
We will hold this experience. Take a spoon and a candle. Hold the spoon over a candle. Spoon will blur, covered with water droplets.
Where did the water? It is clear that from candles, more nowhere.
Now Vitrum spoon and hold it over the flame. Spoon covered with soot - tiny particles of coal. Where did the coal? Again from the candles.
So when the candle burns, it produces water and carbon. Where do they go?
The water is emitted in the form of steam. This is something couples and sits down on the spoon when we hold over the flame.
But where does the coal?
When the candle bloat, coal is emitted as soot - small pieces of coal. Copote sits on the ceiling, on the walls of the surrounding things. But if the candle burns well, no soot - all coal is burned.
Burns? What is a burn?
The whole story starts again. Where coal does when it burns?
One of two things: either it disappears, disappears completely, or it turns into some other substance, which we simply do not see.
Try to catch the invisible. For this we will need two cans of jam and a piece of candle. The candle should push the wire so that it was easier to drop into the jar. And necessary to pour a glass of lime water. The water that we will prepare: take a little quicklime, razboltat it in water and strain through blotting paper. If the solution will turn cloudy, we strain it again, so it was quite transparent.
Now light the candle and lower it gently onto the bottom of the empty cans. The candle would burn out will burn out and turn off. Pull it, will light and put in a jar again. This time the candle will go out immediately, as if it was immersed in water.
It means that the Bank now there's something that prevents the candle to burn.
What can there be? Indeed, in view of the Bank completely empty.
Will do then. Add in a jar of lime water. Water will zametica will become white. And if we put the lime water in the other Bank, where there was nothing, the water will remain clear. So, in one Bank, where previously the candle burned, there is an invisible gas, which makes lime water cloudy.
Scientists have named this gas is carbon dioxide. They found that carbon dioxide is obtained when burning coal.
Now we can answer the question, where does the candle. She becomes first in coal and water. Water flies, as the coal burns and turns into carbon dioxide.
The same thing happens with the wood. Wood also turn into coal and water. The coal burns, though not all: a bit of unburned coal always remains in the oven. And burnt carbon, i.e. carbon dioxide, is emitted together with water vapor in the pipe. White smoke, which fells in winter from pipes, this is the water vapor condensed in the cold in the water droplets. And if the smoke is black, then the stove bloat; the smoke is a lot of unburned coal - soot.