| Term | Definition |
| condensation | the liquid that forms when a gas changes into a liquid |
| condense | change from a gas to a liquid |
| dew point | the temperature that air must reach in order to become saturated |
| humidity | the amount of water vapor in the air |
| ratio | the relationship between the quantity of two or more things |
| relative humidity | a ratio that compares the amount of water vapor that ari is holding to the maximum amount that the air can hold at a given temperature; this ratio is stated as a percentage |
| saturated | filled with the maximum amount of water that the air can hold |