| A | B |
|---|
| Relative humidity | The ratio of the air's water vapor content to its water vapor capacity |
| Absolute humidity | Mass of water vapor per volume of air (i.e. grams of water per cubic meter of air) |
| Cloud | Dense concentration of suspended water droplets or tiny ice crystals |
| Condensation | Change of state from gas to liquid |
| Cumulus | Billowy individual cloud masses that often have flat bases |
| Cirrus | Thin, delicate ice crystal, thin wispy fibers |
| Cyclone | Low atmospheric pressure;rotating and converging winds; ascending air |
| El Nino | Periodic warming of the ocean in the central and eastern Pacific |
| Fog | Cloud with its base at or near Earth's surface |
| Meteorology | Study of weather and climate |
| Stratus | Low clouds; sheets or layers that cover much of the sky |
| Wind | Air flowing horizontally with respect to Earth's surface |
