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    • Thread Starter

    Air is saturated (air with water in it)
    T = 40C
    P = 3 bar

    i need to work out the density of this vapour, now is the vapour the air with the water or just the water?

    is the solution a simple rearrange of the ideal gas law


    n/V = P/RT

    m/V = PMv/ RT (Mv is molecular weight of water or air? Do i average the two? not sure about this)

    Or is it down the road of humidity?

    Any help greatly appreciated, even a prod in the right direction is fab

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