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Introduction to water
- Earth’s temperature special properties of
Class 4a: Atmospheric moisture Introduction to water Earths - - PDF document
Class 4a: Atmospheric moisture Introduction to water Earths - - PDF document
Class 4a: Atmospheric moisture Introduction to water Earths temperature special properties of water Introduction to water Energy needed to change state Evaporation How does water evaporate? Evaporation Water vapor
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SLIDE 3
Introduction to water
- Energy needed to change state
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Evaporation
- How does water evaporate?
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Evaporation
- Water vapor stores latent heat
- Vapor pressure: pressure
exerted by water vapor
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Vapor pressure
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Evaporation
- How quickly does water evaporate?
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Humidity
- Absolute humidity: ratio of water vapor to a
given volume of air
- Specific humidity: ratio of water vapor to a
given mass of air
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Humidity
- Relative humidity: ratio of water vapor to
maximum water vapor capacity
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Dew point
- When air cools, water vapor capacity _____
and relative humidity _____
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Condensation
- Condensation: water vapor becomes liquid,
releases latent heat
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Lapse rates
- Normal lapse rate: 3.5°F/1000 feet
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Adiabatic processes
- Air changes temperature by convection, not
conduction
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Adiabatic processes
- If a rising parcel of air cools to its dewpoint,
then ______ occurs
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Adiabatic processes
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Stability of air
- Buoyancy: tendency of an object to rise
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Stability of air
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Stability of air
- Stability: normal lapse rate of surrounding air
is less than DALR
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Stability of air
- Unstable air: normal lapse rate of surrounding
air is greater than DALR
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Stability of air
- Conditionally unstable air: stable up to a point
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