The relative humidity of air at 80°F and 14.7 psia is increased from 45 percent to 90 perc...

The relative humidity of air at 80°F and 14.7 psia is increased from 45 percent to 90 percent during a humidification process at constant temperature and pressure. Determine the percent error involved in assuming the density of air to have remained constant. Answer: 1.7 percent