Create an account
A method for converting from one unit system to another that involves multiplying fractions.
A measurement of the air temperature in relation to the relative humidity used as an indicator of the perceived temperature.
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.
The Greenhouse Effect
The process by which certain gases (principally water vapor, carbon dioxide, and methane) trap heat that radiates from earth.
The fear that the greenhouse effect might run out of control, heating the entire 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.
Electromagnetic radiation with energy higher than visible light but lower than X-rays.
Combustion in which not enough oxygen is supplied to completely burn the fuel. Carbon monoxide is a common product.
A term commonly used to refer to the device that converts carbon monoxide in the exhaust of an automobile into carbon dioxide.
Government standards that regulate the average number of miles an automobile can travel on a single gallon of gasoline.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together