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The instrument used to measure the atmospheric pressure is
  • a)
    manometer
  • b)
    hygrometer
  • c)
    lactometer
  • d)
    barometer 
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
The instrument used to measure the atmospheric pressure isa)manometerb...
The instrument used to measure the atmospheric pressure is the **barometer**. This device is specifically designed to measure the pressure exerted by the Earth's atmosphere. Here is a detailed explanation of why a barometer is used to measure atmospheric pressure:

**Barometer:**
A barometer is an instrument that measures atmospheric pressure. It consists of a long glass tube filled with mercury or another liquid, with one end sealed and the other end open to the atmosphere. The open end is submerged in a container of mercury, forming a vacuum above it. The pressure exerted by the atmosphere is balanced by the weight of the mercury in the tube, resulting in the height of the mercury column.

**Principle of Operation:**
The principle behind a barometer is based on the concept that atmospheric pressure decreases with increasing altitude. When the atmospheric pressure is high, the mercury in the tube is pushed up, resulting in a higher column height. Conversely, when the atmospheric pressure is low, the mercury column height decreases. By measuring the height of the mercury column, the atmospheric pressure can be determined.

**Types of Barometers:**
There are various types of barometers, including:

1. **Mercury Barometer:** This is the traditional barometer that uses mercury as the liquid. It is based on the principle of balancing the weight of the mercury column with the atmospheric pressure.

2. **Aneroid Barometer:** An aneroid barometer is a compact and portable instrument that uses a small, flexible metal box called an aneroid cell. The cell expands or contracts with changes in atmospheric pressure, which is then converted into a mechanical movement that can be read on a dial.

3. **Electronic Barometer:** Electronic barometers use sensors to measure atmospheric pressure and convert it into an electrical signal. These barometers provide digital readings and are often used in weather stations and meteorological instruments.

**Importance of Measuring Atmospheric Pressure:**
Measuring atmospheric pressure is important for various reasons:

1. **Weather Prediction:** Changes in atmospheric pressure indicate changes in weather conditions. High pressure is associated with fair weather, while low pressure is often associated with storms and precipitation.

2. **Altitude Determination:** By measuring atmospheric pressure, it is possible to estimate the altitude of a location. As atmospheric pressure decreases with increasing altitude, barometers can be used to determine the height above sea level.

3. **Aircraft and Weather Balloon Operations:** Atmospheric pressure measurements are crucial for aircraft operations and weather balloon launches. This information helps pilots and meteorologists understand weather patterns and make accurate predictions.

In conclusion, a barometer is the instrument used to measure atmospheric pressure. It operates on the principle of balancing the weight of a liquid column with the atmospheric pressure. By measuring the height of the liquid column, atmospheric pressure can be determined, providing valuable information for weather prediction and altitude determination.
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The instrument used to measure the atmospheric pressure isa)manometerb)hygrometerc)lactometerd)barometerCorrect answer is option 'D'. Can you explain this answer?
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