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With reference to 'Psychometric Chart', which of the following statement is correct? Conventionally-

  • A.The temperature is taken as the ordinate and the humidity as the abscissa.
  • B.The moisture content is taken as the ordinate and the temperature as the abscissa.
  • C.The speed of wind is taken as the ordinate and the time is taken as the abscissa.
  • D.The time is taken as the ordinate and the speed of wind is taken as the abscissa.

Answer: B

Conventionally, the moisture content is taken as the ordinate and the temperature as the abscissa.

On the standard psychrometric chart (the paper spells it 'psychometric'), dry-bulb temperature is plotted along the horizontal axis and humidity ratio (moisture content, kg of water per kg of dry air) along the vertical axis, usually on the right-hand side. Lines of relative humidity, wet-bulb temperature, enthalpy and specific volume are drawn across this grid.

Option A reverses the axes. Wind speed and time do not appear on a psychrometric chart at all.

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