level: Level 1
Questions and Answers List
level questions: Level 1
| Question | Answer |
|---|---|
| Humidity | The moisture content of air. |
| Absolute Humidity | The mass of water vapour contained in a certain volume of air. |
| Relative Humidity | The ratio of the mass of water vapour in the air at a given temperature to the maximum mass of water vapour the air could hold at that temperature, expressed as a percentage. |
| Greenhouse Effect | The process by which certain gases (principally water vapour, carbon dioxide, and methane) trap heat that radiates from earth. |
| 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. |