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To fix the state point in respect of air-vapour mixtures, three intrinsic properties are needed. Yet, the psychrometric chart requires only two because (a) water vapour is in the superheated state (b) the chart is for a given pressure (c) the chart is an approximation to true values (d) the mixtures can be treated as a perfect gas. |
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Answer» (b) the chart is for a given pressure |
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