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Q78 (NDA-II/2023) Geography › World Physical Geography Official Key

Which one of the following is the usual unit of measurement for Air Pressure used in India ?

Explanation

The correct answer is Option B (Millibar). Air pressure, also known as atmospheric pressure, is the force exerted by the weight of the atmosphere per unit area. In India, the India Meteorological Department (IMD) and meteorological services worldwide primarily use the millibar (mb) or the hectopascal (hPa) as the standard unit for measuring air pressure.

  • Millibar: One millibar is equal to one hectopascal (1 mb = 1 hPa). Weather maps in India use these units to draw isobars (lines of equal pressure).
  • Centimeter: A unit of length, often used to measure rainfall depth.
  • Milligram: A unit of mass.
  • Milliliter: A unit of volume.

The average atmospheric pressure at sea level is approximately 1013.25 millibars. While the SI unit of pressure is the Pascal, the millibar remains the conventional unit in practical meteorology.

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