Which one of the following is the usual unit of measurement for Air Pr

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

Centimeter
Millibar
Milligram
Milliliter
This question was previously asked in
UPSC NDA-2 – 2023
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In meteorology, including in India, air pressure is commonly measured and reported in millibars (mb) or hectopascals (hPa). One millibar is equal to one hectopascal (1 mb = 1 hPa). While the standard international unit for pressure is the Pascal (Pa), millibars/hectopascals remain widely used for atmospheric pressure due to historical conventions and convenience (standard atmospheric pressure at sea level is approximately 1013.25 mb or hPa). Centimeter, Milligram, and Milliliter are units of length, mass, and volume respectively.
Millibar (mb) or Hectopascal (hPa) are the standard units for measuring atmospheric pressure in meteorology.
A mercury barometer or an aneroid barometer are common instruments used to measure air pressure. Pressure is a force per unit area; 1 Pascal is defined as one Newton per square meter (N/m²).

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