What is a aneroid barometer and a manometer ?
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An aneroid barometer and a manometer are both devices used to measure pressure, but they have different designs and purposes.
An aneroid barometer is a device that measures atmospheric pressure. It consists of a small, flexible metal box called an aneroid cell that is partially evacuated. As the atmospheric pressure changes, the aneroid cell expands or contracts, which is then converted into a dial reading using a mechanical linkage system. The dial typically displays the pressure in units of millibars or inches of mercury (inHg). Aneroid barometers are commonly used for weather monitoring and forecasting.
To understand how an aneroid barometer works, you can follow these steps:
1. Start with a sealed metal box that has a flexible lid, known as the aneroid cell.
2. The cell contains a fixed amount of air at the time of manufacture, which is partially evacuated. This creates a pressure reference point.
3. As the surrounding atmospheric pressure changes, the flexible lid of the cell expands or contracts.
4. The movement of the lid is mechanically connected to a system of levers and gears.
5. The mechanical linkage transfers the movement of the lid to a needle or pointer on the dial.
6. The dial is calibrated to display the pressure reading in the desired unit (millibars or inches of mercury).
On the other hand, a manometer is a device used to measure pressure in a closed system, such as in pipes or tanks. It works based on the principle of balancing the pressure within the system against a reference pressure. There are different types of manometers, including U-tube manometers and digital manometers. U-tube manometers consist of a U-shaped tube filled with a liquid (usually mercury or water) connected to the system being measured. The pressure exerted on each end of the U-tube creates a difference in liquid levels, which can be measured and converted into a pressure reading.
To use a manometer, you can follow these steps:
1. Choose the appropriate type of manometer for the application (U-tube, digital, etc.).
2. Calibrate or set the zero reference point of the manometer if necessary.
3. Connect one end of the manometer to the system or device you want to measure the pressure of.
4. Wait for the liquid in the manometer to settle, allowing the pressure to equilibrate.
5. Measure the difference in liquid level between the two ends of the manometer.
6. Convert the difference in liquid level to a pressure reading using the specific calibration or formula provided with the manometer.
In summary, an aneroid barometer measures atmospheric pressure, while a manometer measures pressure in closed systems. An aneroid barometer uses a flexible metal box that expands or contracts with changes in atmospheric pressure, whereas a manometer uses liquid-filled tubes to measure the pressure difference.