HUMIDITY AND DEW POINT. Humidity. amount of water vapor in the air. Specific Humidity. ACTUAL amount of water vapor in the air at a given time and place Units - g of water vapor / Kg of air. Saturated Air At a steady temperature the amount of water vapor is at it’s peak (maximum)
Rate of condensation = Rate of evaporation
Relative humidity = specific humidity X 100%
100% Rel. Hum. – saturated air
0% Rel. Hum. – dry air
Dry air - greater evaporation
- greater cooling
- greater the difference in the 2 temperatures
High humidity – no evaporation (saturated air)
- temperatures of the 2 bulbs will be the same or very close
Why do you feel so hot and sticky on hot, humid days in the summertime?
High humidity means air has a lot of water vapor in it. Your body sweats but the water has no where to go so it stays on your body and you feel sticky and aren’t cooled by the evaporation of the sweat.