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An aneroid barometer is a device used to measure atmospheric pressure without the use of liquid, unlike traditional mercury barometers.
Working Principle:
- Aneroid Cell:
- The main component of an aneroid barometer is an aneroid cell, which is a sealed metal capsule typically made from an alloy with low thermal expansion properties.
- The aneroid cell is partially evacuated to create a partial vacuum inside.
- Changes in atmospheric pressure cause the cell to expand or contract slightly.
- Linkage System:
- Connected to the aneroid cell is a mechanical linkage system that amplifies the small movements of the cell.
- These movements are then transferred to a pointer or needle on a calibrated scale, indicating the current atmospheric pressure.
Key Features:
- Accuracy: Aneroid barometers are highly accurate for measuring changes in atmospheric pressure over time.
- Portability: They are compact and portable, suitable for use in various settings including homes, offices, and meteorological stations.
- Maintenance: Unlike mercury barometers, aneroid barometers do not require regular maintenance or re-calibration, making them more convenient for everyday use.
Usage:
- Meteorology: Aneroid barometers are used in meteorology to monitor and forecast weather patterns based on changes in atmospheric pressure.
- Aviation and Marine Applications: They are also used in aviation and marine navigation to provide real-time pressure readings for safety and operational purposes.
An aneroid barometer is a mechanical device that uses a partially evacuated metal cell to measure atmospheric pressure. Its simplicity, accuracy, and portability make it a valuable tool for meteorologists, pilots, sailors, and anyone interested in monitoring atmospheric pressure for various purposes.
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