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Atmosphere
Atmosphere Notes
20
Science
9th Grade
04/09/2014

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Term
Composition of air
Definition
78% Nitrogen, 20% Oxygen, 1% water vapor, 1% other gases
Term
Humidity
Definition
Amount of water vapor in the air
Term
Pressure & Density
Definition
Different properties at different altitudes, density decreases with increasing altitude.
Term
Air temperature
Definition
Warm air rises, gas molecules move more freely
Term
Troposphere
Definition
Temp is highest near surface of earth, decreases as altitude increases.
Term
Stratosphere
Definition
Ash and gas from volcanic eruptions, layer above troposphere
Term
Mesosphere
Definition
Temp. decreases with altitude, below -90 C
Term
Energy
Definition
Can travel through space or material
Term
Temperature
Definition
A measure of how fast the atoms in a material are vibrating
Term
Heat
Definition
Taken in or released when an object changes state of matter
Term
Heat transfer
Definition
Radiation, convection, conduction
Term
Convection
Definition
Transfer of heat by the movement of warmed matter
Term
Conduction
Definition
Transfer of energy from particle to particle
Term
Radiation
Definition
Electromagnetic waves transfer energy through space
Term
Greenhouse effect
Definition
The heat energy from the sun that hits the earth is not all bounced back into space, gasses warm the atmosphere by trapping heat.
Term
Ozone
Definition
shields life on earth from sun's radiation
Term
Ozone
Definition
Created by 3 Oxygen atoms
Term
Atmosphere
Definition
Keeps earth's temperature moderate
Term
Gases
Definition
Needed for life on earth
Term
Sun's energy
Definition
More energy reaches the low latitude lines near the equator.
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