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Moist air holds water at a partial pressure of 1.7 kilopascals. If the saturation pressure equals 1.7 kilopascals at 15 degrees Celsius, what is the dew point?

  • A.15 degrees Celsius
  • B.0 degrees Celsius
  • C.17 degrees Celsius
  • D.100 degrees Celsius

Answer: A

The dew point is by definition the temperature whose saturation pressure equals the actual partial pressure. Reading the steam table backwards from the partial pressure is the whole calculation. No other property of the air is needed for it.

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