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How can i separate water vapour from a mixture of gases given that water vapour has a lower density than the gases?

I am doing an experiment on separating water vapour from exhaust gases. I have not tried anything yet. I am not sure on how to get started.

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    $\begingroup$ It will be far more practical and efficient to condense the water by cooling the gas mixture. $\endgroup$ – CuriousOne Jan 11 '16 at 8:44
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Cool the mixture to condense the water or absorb the water in (say) dry Calcium Chloride.

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You can check fractional distillation which is used to separate mixture with components having different boiling points which is true in your case.

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