| 1 | Dew point is a temperature, but it measures the absolute humidity of air. | |
| 2 | The measure of the amount of water vapor in air, expressed as either the absolute or relative humidity. | |
| 3 | Diurnal variation of absolute humidity at all levels was higher in a day, and lower at night. | |
| 4 | "Absolute humidity conditions explain most of these changes, " Shaman said. | |
| 5 | The researchers do not know exactly what it is about low absolute humidity that the flu virus likes. |