dew & fog
DESCRIPTION
Dew & Fog. Water Cycle. Evaporation, transpiration + condensation Evaporation rate greatest at equator. Dew Point vs. Dew. Air can hold water vapour = humidity. Dew Point vs. Dew. Absolute Humidity – amount of water vapour in the air Relative Humidity - % of water in the air. - PowerPoint PPT PresentationTRANSCRIPT
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Dew & Fog
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Water CycleEvaporation, transpiration +
condensation
Evaporation rate greatest at equator
![Page 3: Dew & Fog](https://reader033.vdocument.in/reader033/viewer/2022061520/56816302550346895dd37b2a/html5/thumbnails/3.jpg)
Dew Point vs. DewAir can hold water vapour =
humidity
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Dew Point vs. DewAbsolute Humidity – amount of
water vapour in the air
Relative Humidity - % of water in the air
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Dew Point vs. DewWhen the air cannot hold anymore
vapour it is 100% saturated
This is the Dew Point
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Dew Point vs. DewAt the Dew Point – water vapour
condenses
Warmer the air temperature, higher the dew point
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Dew Point vs. DewCondensed water vapour = dew
When it freezes = frost
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FogWhen air close to the ground cools
enough & reaches the dew point
Water vapour can form a low cloud
Radiation Fog & Advection Fog
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Radiation FogForms during cloudless & windless
nights
low lying fog
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Radiation FogAt night, ground cools rapidly
Cools the air
Air reaches dew point, condenses into fog
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Advection FogNeeds air to be moving (wind)
Warm, moist air moves over a cool surface (snow or water)
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Advection FogCan cause problems in Vancouver,
Victoria, Seattle, San Francisco