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Thread: The broken elevator

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    The broken elevator

    What goes up, but doesn't go down?


     



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    age...

    but what is that topic name?? to confuse us??

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    Quote Originally Posted by Muffy
    age...

    but what is that topic name?? to confuse us??


    what is that topic name?? to confuse us??

    Extactly

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    wow!!!
    i first put another answer related to the topic name...

    but i changed it again!!!

    nan romba smart!!!!!! right aa??

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    Very Very Smart

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    thanks!!

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    What about smoke?

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    Or a bubble

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    we can make them come down...

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    Why does smoke rise?

    As you probably know, smoke is made of a lot of tiny particles -- mostly solid, some liquid -- suspended in air.

    The particles are a lot heavier (more dense) than air, so why don't they sink out and go down rather than going upward?

    Here is an explanation of sorts:

    A fire makes things hot.

    Above a fire, you get quite a lot of hot air.

    Hot air is less dense than cool air, so it rises.

    Because there is quite a lot of hot air, it makes quite a big wind current as it rises, and that drags the smoke particles upward with the air, in much the same way as wind can raise dust.

    Some of the smoke particles are very small indeed, so they can be held up in the air for quite a long time, and they do not settle out from the air until a long time after they leave the fire, and usually some distance away from the fire.

    In a large bushfire, all the hot air produced makes very strong currents indeed, and not only fine particles, but also quite large burning twigs and leaves can be carried up in the smoke, and do not fall out until they have travelled quite some distance.

    It is these pieces of burning vegetation -- called "embers" -- that often start secondary fires, and make fighting large bush fires extremely difficult and dangerous.

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