module 2 Flashcards
What is 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 trap heat that would otherwise escape the earth and radiate into space.
parts per million
the number of molecules (or atoms) of a substance in a mixture for every one million molecules (or atoms) in that mixture.
What is the heat index?
a combination of temperature and humidity- the “feels like” temperature.
Why does sweating cool you down?
Sweat cools you off because when it evaporates, it takes energy from your skin. When energy leaves your skin, you feel cooler.
What is the percentage of nitrogen and oxygen in dry air?
78 % nitrogen and 21% oxygen
What makes up the majority of the air that we exhale?
Nitrogen
