Normal alveolar air is best represented by which set of values?

  1. a temperature of 22oC, absolute humidity of 10 mg/L and relative humidity of 50%.
  2. a temperature of 37oC, absolute humidity of 22 mg/L and relative humidity of 50%.
  3. a temperature of 37oC, absolute humidity of 44 mg/L and relative humidity of 100%.
  4. a temperature of 33oC, absolute humidity of 37 mg/L and relative humidity of 100%.