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Thread: ideal gas

  1. #1 ideal gas 
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    Hi

    Im not sure if i understand when a ideal gas is valid?

    I'm assuming when there is no forces acting on the molecules and when the molecules take up no volume ?

    I don't understand the logic

    A)no forces act on molecules when they are spaced far apart and don't interact with each other. Therefore, there must be sufficient volume

    B) Molecules take up no volume when they don't bind to each other ?

    I have no idea. Its been ten years since i was in school


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  3. #2  
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    perfectly uniform and homogeneous.


    Wise men speak because they have something to say; Fools, because they have to say something.
    -Plato

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  4. #3 re 
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    your way too smart for me

    I didn't understand that :-D
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  5. #4  
    Forum Ph.D. Nevyn's Avatar
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    An ideal gas is where there are no intermolecular forces between the molecules which means that the gas has no potential energy only kinetic.
    In reality I don't think an Ideal gas is ever valid because they have to be treated as "point-particles" and therefore have no volume.
    Come see some of my art work at http://nevyn-pendragon.deviantart.com/
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  6. #5  
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    sorry the question is asking under what conditions of temp and pressure is it valid ? and why ?

    low pressure and high temp.

    why cause the molecules don't stick together
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  7. #6  
    Forum Ph.D. Nevyn's Avatar
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    depends on the gas if you want specifics. I think that it becomes less reliable under a lower temperature or higher pressure because both are 'pushing' the molecules towards a different phase i.e. solid or liquid.
    Come see some of my art work at http://nevyn-pendragon.deviantart.com/
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  8. #7  
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    thanks never thought of that

    i don't think she wants specifics just the basic ideas
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