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Water in the Atmosphere
Vocabulary Review
23
Science
9th Grade
02/11/2013

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Term
Cumulus
Definition
Cumulus clouds are puffy clouds that sometimes look like pieces of floating cotton. The base of each cloud is often flat and may be only 1000 m (330 ft) above the ground
Term
Stratus
Definition
Stratus Clouds

Stratus clouds are uniform grayish clouds that often cover the entire sky. They resemble fog that does not reach the ground.
Term
Cirrus
Definition
Cirrus clouds are thin, wispy clouds blown by high winds into long streamers. They are considered "high clouds" forming above 6000 m (20,000 ft).
Term
Relative Humidity
Definition
The ratio of the amount of water in the air compared to the total amount of water the air can hold
Term
Absolute Humidity
Definition
The measure of the amount of water actually present in a given amount of air
Term
Dew Point
Definition
The temperature where the rate of evaporation and the rate of condensation are equal; below this temperature condensation will occur
Term
Condensation
Definition
When water vapor turns from a gas into a liquid
Term
Evaporation
Definition
When liquid water turns in to water vapor
Term
Dew
Definition
Formed when water condenses onto a surface that is above freezing temperature
Term
Frost
Definition
Formed when water condenses onto a surface that is below freezing
Term
Condensation nuclei
Definition
Suspended particles in the air that provide the surface for water vapor to condense on to form fog/clouds
Term
Water Cycle
Definition
to process that changes water from a solid to liquid to gas due to changes in temperature
Term
Freezing
Definition
The process of turning liquid water into solid ice
Term
Melting
Definition
The process of turning solid ice into liquid water
Term
Precipitation
Definition
The process of water falling to earth
Term
Fog
Definition
Clouds that form near the surface of the Earth
Term
Rain
Definition
Liquid precipitation
Term
Drizzle
Definition
Rain with very small droplets
Term
Sleet
Definition
Rain that falls through a freezing layer of air very near the surface forming ice pellets
Term
Snow
Definition
Frozen water crystals that fall through thick layers of air below freezing
Term
Freezing Rain
Definition
Rain that falls as a liquid but freezes on contact with a surface that has a temperature below 32-degrees
Term
Hail
Definition
Lumps of ice that fall through layers of air where it melts then refreezes numerous times
Term
Saturated
Definition
A term used to describe air that is holding all of the water vapor it can possibly hold
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