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Chapter 3

TermDefinition
Weather The condition of Earths atmosphere at a particular time and place.
Atmosphere The envelope of glasses that surrounds Earth.
Water vapor Water in the form of gas.
Density The ratio of the mass of a substance to its volume.
Air pressure The pressure caused by the weight of a column of air pushing down on an area.
Barometer An instrument used to measure changes in air pressure.
Mercury barometer An instrument that measures changes in air pressure, consisting of a glass tune partially filled with Mercury, with its open end resting in a dish of mercury.
Aneroid barometer An instrument that measures changes in air pressure without using liquid.
Altitude Elevation above sea level.
Troposphere The lowest layer of Earths atmosphere.
Mesosphere The layer of Earths atmosphere immediately above the stratosphere.
Stratosphere The second lowest layer of Earths atmosphere.
Thermosphere The outermost layer of Earths atmosphere.
ionosphere The lower part of the thermosphere.
exosphere The outer layer of the thermosphere.
Electromagnetic waves A wave that can transfer electric and magnetic energy through the vacuum of space.
Radiation The transfer of energy by electromagnetic waves.
Infrared radiation Electromagnetic waves with wavelengths that are longer than visible light but shorter than microwaves.
Scattering Reflection of light in all directions.
Ultraviolet radiation Electromagnetic waves with wavelengths that are shorter than visible light but longer than X-rays.
Greenhouse effect The trapping of heat near a planets surface by certain gases in the planets atmosphere.
Created by: emurray121
 

 



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