13 Jan Relative Humidity

Lesson objective

• - What is relative humidity? Resource pack P21
• - How do we measure relative humidity using a sling psychrometer?

Video - https://www.youtube.com/watch?v=Qsl5yQsinlY


Can we use Hygrometer too? - https://en.wikipedia.org/wiki/Hygrometer


Geographical Investigation - Sling Psychrometer -  Text P172

1. Dip the wick of the wet bulb in water
2. Swing the sling psychrometer at a steady pace away from your body
3. After 1 min, record the temp on the WET bulb
4. Swing another 1 min, record the temp again (If temp is different, to repeat again)
3. Record the DRY bulb temp
5. Find the wet bulb depression : Dry bulb temperature minus wet bulb temperature
6. Use table to determine the RH %


Resource pack questions
-P48 a,b,c Springfield
-P49 a,b GMS
-P60&61 AHS