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Dew & Fog

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.

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Dew & Fog

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  1. Dew & Fog

  2. Water Cycle • Evaporation, transpiration + condensation • Evaporation rate greatest at equator

  3. Dew Point vs. Dew • Air can hold water vapour = humidity

  4. Dew Point vs. Dew • Absolute Humidity – amount of water vapour in the air • Relative Humidity - % of water in the air

  5. Dew Point vs. Dew • When the air cannot hold anymore vapour it is 100% saturated • This is the Dew Point

  6. Dew Point vs. Dew • At the Dew Point – water vapour condenses • Warmer the air temperature, higher the dew point

  7. Dew Point vs. Dew • Condensed water vapour = dew • When it freezes = frost

  8. Fog • When air close to the ground cools enough & reaches the dew point • Water vapour can form a low cloud • Radiation Fog & Advection Fog

  9. Radiation Fog • Forms during cloudless & windless nights • low lying fog

  10. Radiation Fog • At night, ground cools rapidly • Cools the air • Air reaches dew point, condenses into fog

  11. Advection Fog • Needs air to be moving (wind) • Warm, moist air moves over a cool surface (snow or water)

  12. Advection Fog • Can cause problems in Vancouver, Victoria, Seattle, San Francisco

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