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Difficulty: MediumWeather Elements, Instruments, and Measurements

At a weather station, a meteorological observer inspects an instrument equipped with a flexible, partially evacuated corrugated metal capsule that expands and contracts in response to changes in atmospheric conditions. Which weather element does this instrument measure, and what is its standard unit of measurement?

  1. Atmospheric pressure, measured in millibarsAnswer
  2. B
    Relative humidity, measured in percentage
  3. C
    Wind velocity, measured in knots
  4. D
    Sunshine duration, measured in hours

Answer

Atmospheric pressure, measured in millibars
The correct answer identifies atmospheric pressure measured in millibars because an aneroid barometer operates using an evacuated, sealed corrugated metal cell that flexes under atmospheric pressure changes, moving an indicator needle across a scale calibrated in millibars.

Step-by-Step Solution

1
Identify the operating mechanism described in the stem
The mechanism featuring a flexible, partially evacuated corrugated metallic cell (aneroid capsule) is characteristic of an aneroid barometer.
The aneroid cell reacts mechanically to external pressure differences without using liquid columns like mercury.
2
Determine the weather element measured by an aneroid barometer
Atmospheric pressure.
Barometers are designed specifically to record atmospheric force per unit area.
3
Identify the standard meteorological unit for atmospheric pressure
Millibars (mb) or hectopascals (hPa).
Standard meteorological convention uses millibars or hectopascals for pressure readings.

Key Concept

Operating principles of weather instruments and their parameters
Estimated Time:1m 0s
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Topics

Weather Elements, Instruments, and Measurements

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