Moisture in the Atmosphere Beaker demo

Humidity Humidity - how much moisture is in the air. Saturated air is air that is full of water. Dew point is the point that air must be cooled to for a cloud to form.

Humidity How do we measure humidity? i Sling Psychrometer ii Dry Bulb- Air temperature iii Wet Bulb – temperature of saturated air.

Write this down! (NEXT PAGE OF NOTES) 1)To find the RH you need the dry bulb (temperature) in o C 2)Then find the difference between Dry Bulb and Wet Bulb. 3)Look up DB 4)Look up Difference 5)Where they intersect is the Rel Humidity.

What is the Humidity if: –DB=10 o C & WB=10 o C 100% –DB=20 o C & WB=7 o C 5% –DB=0 o C & WB=-1 o C 81% –DB=-10 o C & WB=-12 o C 33%

Dew Point This is the point where water vapor condenses to form clouds. How do we measure it? –Same way we did with the humidity. How do we find it? –Same way as humidity but with different chart.

ESRT Practice 1)To find the DP you need the dry bulb (temperature) in o C 2)Then find the difference between Dry Bulb and Wet Bulb. 3)Look up DB 4)Look up Difference 5)Where they intersect is the Dew Point. Dry Bulb ALWAYS greater then Wet Bulb

Practice What is the Dew Pt if DB=0 o C & WB= -4 o C? -15 o C What is the Humidity if DB=0 o C & WB=4 o C? 28% What is the WB if DB=4 o C & DP= -11 o C? -1 o C What is the Dew P if the DB=8 o C & Hum=39%? -5 o C Dry Bulb ALWAYS greater then Wet Bulb

The Water Cycle The process of water flowing to an from the oceans. Draw this

Important parts of Water Cycle Evaporation –Liquid water changing to gas Condensation –Gas vapor to liquid water Precipitation –Water falling to the ground Infiltration –Water being absorbed Run off –Water flowing off of surface