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Air at 40 degrees Celsius has a saturation humidity of 0.049 and an actual humidity of 0.0245 kilograms per kilogram of dry air. What is the percentage humidity?

  • A.100 per cent
  • B.5 per cent
  • C.50 per cent
  • D.25 per cent

Answer: C

The ratio of the two humidities is one half. The relative humidity of the same air would be a slightly different figure, since it is a ratio of pressures rather than of humidities. The two agree only at zero and at full saturation.

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