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Glossary of Apologia Physical Science, Module 2

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humidity
the moisture content of air
absolute humidity
the mass of water vapor contained in a certain volume of air
relative humidity
a quantity expressing humidity as a percentage of the maximum absolute humidity for that particular temperature
greenhouse effect
the process by which certain gases (principally water, carbon dioxide, and methane) trap heat that would otherwise escape the earth and radiate into space
parts per million (ppm)
the number of molecules (or atoms) of a substance in a mixture for every one million molecules (or atoms) in that mixture
What is dry air made up of?
78% nitrogen and 21% oxygen
What makes up the majority of the air we inhale and exhale?
nitrogen
True or False: Global warming and the greenhouse effect are the same thing.
False
global warming
when the concentration of carbon dioxide and other greenhouse gases increase too much causing the earth to become too warm
What pollutant gas is a deadly by-product of incomplete combustion?
carbon monoxide

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