The key difference between a barometer and an altimeter lies in their purpose and application, even though they both measure atmospheric pressure.
Purpose and Application:
| Feature | Barometer | Altimeter |
|---|---|---|
| Purpose | Measures subtle pressure changes caused by weather. | Measures altitude based on atmospheric pressure. |
| Usage | Kept at the same level to detect weather changes. | Used at different levels to match pressure to altitude. |
| Application | Weather forecasting; tracking atmospheric conditions at a fixed location. | Aviation; hiking; any activity requiring altitude measurement. |
Detailed Explanation:
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Barometer: A barometer is an instrument used to measure atmospheric pressure. Its primary function is to detect changes in pressure that indicate weather patterns. High pressure generally correlates with clear skies and stable weather, while low pressure indicates the potential for storms and precipitation. According to the provided reference, a barometer is kept at the same level and measures subtle pressure changes caused by weather and elements of weather.
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Altimeter: An altimeter, on the other hand, is a device used to measure altitude (height above a reference point, usually sea level). Altimeters work by measuring atmospheric pressure, which decreases as altitude increases. They are calibrated to translate this pressure reading into an altitude measurement. The reference explains that an altimeter is intended to be used at different levels matching the corresponding atmospheric pressure to the altitude.
In essence, while both devices measure atmospheric pressure, a barometer monitors pressure changes at a fixed location for weather prediction, while an altimeter measures altitude based on pressure changes as it moves vertically.
