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Thread: Does Gas/Liquid/Solid Molecules move with the same speed?

  1. #1 Does Gas/Liquid/Solid Molecules move with the same speed? 
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    Does Gas/Liquid/Solid Molecules move with the same speed?


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  3. #2 Re: Does Gas/Liquid/Solid Molecules move with the same speed 
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    Quote Originally Posted by Mphisto
    Does Gas/Liquid/Solid Molecules move with the same speed?
    This is a physics question.

    Temprature is a medium value of the molecules movement in a room.
    And you know that water is liquid between 0 and 100 degres celcius in normal atmosphere pressure.
    So when you heat up water on your stowe the molecules that move fast enough will become gas.
    But if you have a room of gas the molecules would differ in movement just like in a room where you messure the temperature.

    So to answer your question NO, they do not move with the same speed.

    There is something on this subject called "Maxwells deamon". He wondered if you could get energy out of nothing by being so small that you could see and messure the molecules movement, and then open a door for the fast molecules and closing it for the slow. Making one room colder and one room hoter.
    But it has been proven wrong, because it takes energy to do messurements.
    http://en.wikipedia.org/wiki/Maxwell%27s_demon


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  4. #3  
    Forum Freshman Solid State's Avatar
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    No. That is a function of heat and mass.

    Additionally, not even all gas molecules move at the same speed.

    For example, a molecule of H2 has to move at a greater speed an atom of Ar. This, in itself, is a function of kinetic energy.

    That is how lighter gases maintain proportional partial pressures in a gaseous mixture.

    If you have a mixture of 50%H2/50%Ar at 1000psia, for all practical purposes, 500psia of that pressure will be from the H2 and 500psia will be from the Ar.

    Molecular speed and KE is what makes this possible.
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  5. #4  
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    The question needs to be a little clearer dude.

    Do they move as the same speed as what, one another? What sort of movement are we talking about? Vibration, rotation just in a straight line.
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  6. #5 Re: Does Gas/Liquid/Solid Molecules move with the same speed 
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    Quote Originally Posted by Mphisto
    Does Gas/Liquid/Solid Molecules move with the same speed?
    No solid liquids nor gases do not have the same speed, remember that they are all composed differently, more over their masses can vary between different molecules, so thats another factor.
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