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Water in the Air
Water in the Air
14
Science
7th Grade
03/04/2014

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Cards

Term
water vapor
Definition
gaseous phase of water
Term
condensation
Definition
when water is changed from gas to liquid
Term
humidity
Definition
water vapor in the air
Term
saturated
Definition
when air contains as much water vapor as it can
Term
relative humidity
Definition
measured in %
How meteorologists describe the amount of water vapor in the air
Term
transpiration
Definition
water leaves plants as vapor
Term
dew point
Definition
the temperature at which air is saturated
Term
condensation nucleus
Definition
the particle on which water vapor condenses in the air to form a cloud
Term
precipitation
Definition
water that falls from the sky
*dew and frost are not precipitation because the do not fall from the sky
Term
evaporation
Definition
when liquid water changes from a liquid to a gas (water vapor)
Term
Formula for relative humidity
Definition
the amount of water vapor in the air */* the amount of water vapor air can hold. X by 100 to get %
Term
How clouds form
Definition
1. sun heats up Earth (Radiation)
2. the warm air heated by conduction w/ Earth's crust
3. warm air rises-convection
4. as the air rises it begins to cool
5. the air reaches dew point and condenses into a cloud
Term
How does condensation form?
Definition
When humid air comes in contact with a cold surface the heat transfers from hot air and condenses on the cold surface.
Term
How does evaporation take place?
Definition
When the heat from the sun causes the water molecules to break apart and turn into water vapor.
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