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atsci ch 4

humidity

QuestionAnswer
what does a higher dewpoint indicate? more absolute humidity (more water vapor in the air)
what happens to the diurnal temperature cycle when precipitation occurs? it stops or flattens
what causes water molecules to escape from the liquid layer into the air? higher temperature increases molecular speed, leading to more escape
what causes vapor molecules to return to the liquid layer? higher vapor content increases collisions, leading to more return
what is the condition when return < escape? evaporation (sub-saturated air)
what is the condition when return > escape? condensation (super-saturatred)
what is the condition when return = escape? saturation
what is relative humidity (RH)? the ratio of actual vapor pressure to saturation vapor pressure, expressed as a percentage
what does RH = 100% mean? the air is saturated
what does RH < 100% mean? the air is sub-saturated (evaporation occurs)
what does RH > 100% mean? the air is super-saturated (condensation)
how are RH and temperature related? inversely - higher temperature lowers RH, and lower temperature raises RH
what does dew point tell us about the atmosphere? it shows how much the air must cool to reach saturation and reflects absolute humidity
can dewpoint ever be higher than air temperature? no, Td <= T always
what is the boiling point of water in Denver (850 mb)? 95°C (203°F), lower due to reduced atmospheric pressure
what does the heat index measure? apparent temperature, combining air temperature and RH
what two ways can RH be changed? by changing vapor content or changing temperature (saturation point)
Created by: user-1978214
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