Relative Humidity The relative humidity is a RATIO
- Slides: 21
Relative Humidity The relative humidity is a RATIO of the actual amount of water in the air compared to how much it COULD hold. How much moisture is in the air relative to how much it can hold
DEW POINT The dew point is the temperature that air needs to be cooled to in order to be saturated (completely full of water). Not Doo This dew Doo Dew Point is the temperature it needs to be for air to be completely full of water
Dew Point and Relative Humidity • The instrument used to measure dew points and relative humidity is a sling psychrometer.
Dry Bulb (Air) Temperature Wet Bulb Temperature Difference Dewpoint Temperature Relative Humidity _______ °C _______ % 26°C - 18°C = 1. 8 _______ °C Dry bulb was 26°C 18°C
13° C 26°C
Dry Bulb (Air) Temperature Wet Bulb Temperature Difference Dewpoint Temperature Relative Humidity 25°C - 18°C = 1. 8 _______ °C Dry bulb was 26°C 18°C 13° C _______ °C _______ %
45%
Dry Bulb (Air) Temperature Wet Bulb Temperature Difference Dewpoint Temperature Relative Humidity 26°C - 18°C = 1. 10 _______ °C Dry bulb was 26°C 18°C 13° C _______ °C 45% _______ %
5 48% 1°C
5°C 48% 1°C 2°C 83% 19°C 86% 4°C 1°C
20°C 91. 5% 14°C
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1. The lowest air temperature occurred at what time? 6 am 2. The highest relative humidity reading occurred at what time? 6 am 3. The highest air temperature occurred at about what time? 3 pm 4. The lowest relative humidity occurred at about what time? 3 pm
5. According to the graph, what happens to the relative humidity as the air temperature increases? As Temperature Increases- Relative Humidity Decreases 6. At what time(s) did the air temperature equal the dew point? 6 am 7. What was the relative humidity (%) when the air temperature equaled the dew point? 100%
8. Condensation (water coming out of the air) is most likely to occur at approximately what time? 6 am 9. At approximately what time was the rate of evaporation highest? 3 pm 10. The greatest change in air temperature occurred during the period from: A) midnight to 6 AM C) 6 AM to noon B) noon to 6 PM D) 6 PM to midnight
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