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| Q. |
What happens to atmospheric pressure with increase in altitude? |
| A. | It remains constant |
| B. | It decreases |
| C. | It increases |
| D. | It constantly fluctuates |
| Answer» B. It decreases | |
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Explanation: In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the mass of air above the measurement point. Low-pressure areas have less atmospheric mass above their location, whereas high-pressure areas have more atmospheric mass above their location. Likewise, as elevation increases, there is less overlying atmospheric mass, so that pressure decreases with increasing elevation. |
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