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Apologia
Module 2
| Question | Answer |
|---|---|
| Absolute humidity | The mass of water vapor contained in a certain volume of air. |
| Greenhouse effect | The process by which certain gases (principally water, carbon dioxide, and methane) trap heat that would otherwise escape the earth and radiate into space. |
| Humidity | The moisture content of the air. |
| 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. |
| Relative humidity | A quantity expressing humidity as a percentage of the maximum absolute humidity for that particular temperature. |
| What is PPM? | Parts per million |
| What is the percentage of nitrogen in dry air? | 78% |
| What is the percentage of oxygen in dry air? | 21% |
| If you put a glass of water outside when the relative humidity is 100%, how quickly will the water evaporate? | The water will not evaporate. Since the relative humidity is 100%, the air cannot hold any more water vapor. As a result, no water will evaporate from the glass. |
| Why does sweating cool people down? | Sweat cools you off because when it evaporates, it takes energy from your skin. When energy leaves your skin, it gets cooler. |
| What would be the consequence of removing all of the carbon dioxide in earth’s air supply? | If the air had no carbon dioxide in it, the earth would be colder. |
| What would be the consequence of removing all of the ozone in earth’s air supply? | If there were no ozone in the air, ultraviolet light would kill all living things. |
| What would be the consequence of a sudden increase in the concentration of oxygen in the earth’s air supply? | If more oxygen were in the air, lifespans would decrease and forest fires would increase infrequency and ferocity. |
| What makes up the majority of the air that we exhale? | Nitrogen makes up the majority of the air we exhale. |
| Is global warming happening today? | No. Figure 2.4 shows that the average global temperature has been reasonably constant for the past 70 years. |
| What does a catalytic converter do in a car? | A catalytic converter converts carbon monoxide in the car’s exhaust to carbon dioxide. |
| The concentration of carbon dioxide in the air today is approx. 340 ppm. What is the concentration in percent? | 340 ppm/1 * 1%/ 10,000 ppm = 0.0340% |
| The concentration of oxygen in air is 21%. What is that concentration in ppm? | 21%/1 * 10,000 ppm/1% = 210,000 ppm |
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