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Science

Apologia Physical Science Mod. 1-3a

QuestionAnswer
Atom The smallest chemical unit of matter
Molecule Two or more atoms linked together to make a substance with unique properties
Concentration The quantity of a substance within a certain volume
Humidity The moisture content of air
Absolute Humidity The mass of water vapor contained in a certain volume of air
Relative Humidity The ratio of the mass of water vapor in the air at a given temperature to the maximum mass of water vapor the air could hold at that temperature, expressed as a percentage.
Greenhouse Effect The process by which certain gases (principally water vapor, carbon dioxide, and methane) trap heat that radiates from earth
Parts per Million The number of molecules (or atoms) of a substance in a mixture for every 1 million molecules (or atoms) in that mixture
Atmosphere The mass of air surrounding a planet
Atmospheric Pressure The pressure exerted by the atmosphere on all objects within it
Barometer An instrument used to measure atmospheric pressure
Homosphere The lower layer of earth's atmosphere, which exists from ground level to roughly 80 kilometers (50 miles) above sea level
Heterosphere The upper layer of earth's atmosphere, which exists higher than roughly 80 kilometers (50 miles) above sea level
Troposphere The region of the atmosphere that extends from ground level to roughly 11 kilometers (7 miles) above sea level
Stratosphere The region of the atmosphere that spans altitudes of roughly 11 kilometers to 48 kilometers (30 miles)
Mesosphere The region of the atmosphere that spans altitudes of roughly 48 kilometers to 80 kilometers (50 miles)
Jet streams Narrow bands of high-speed winds that circle the earth, blowing from west to east
Popular Physical Science sets

 

 



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