Relative humidity and dew point (elt 2, 3, 4)

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Presentation transcript:

Relative humidity and dew point (elt 2, 3, 4)

Layers of atmosphere Thermosphere: Temps increase w/height No well-defined upper limit Mesosphere: Temps decrease w/ height Meteors Stratosphere: Ozone layer Troposphere: Temps decrease w/height Weather occurs

Relative humidity the amount of water vapor in the air compared to what the air can "hold" at that temperature represented as % Warm air holds more vapor, cold air holds less vapor 100% = saturation, 100%+ vapor condenses into liquid (clouds, fog, dew)

Dew point Represented as temp (°F/C) The temperature at which air reaches 100% humidity (saturation) Higher the dew point, the more moisture in the air (the more “sticky” if feels)

Cloud formation The sun heats up the air (and water vapor in the air)radiation This causes air to rise (low pressure) convection Relative humidity over 100% (dew point reached) Water vapor is cooled to dew point during upward movement Vapor condenses into droplet on dust particles in atmosphere