Discussion
The Psychometric chart is used to-
Answer: A
The chart is used to represent the state of moist air.
A psychrometric chart shows the thermodynamic properties of air-water vapour mixtures at a given total pressure. Any two known properties, such as dry-bulb and wet-bulb temperature, fix a point on the chart, from which the others (humidity ratio, relative humidity, dew point, enthalpy, specific volume) can be read. It is used to design and analyse drying, cooling and air conditioning.
It does not show air speed, and atmospheric pressure is held constant for a given chart, not represented on it. 'Potential energy in the air' is not one of its properties.
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