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, which is about 1.00 atm. Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibar as the values are convenient. Since the advent of SI units, some meteorologists began using hectopascals (symbol hPa) which are numerically equivalent to millibar; for the same reason, the hectopascal is the standard unit used to express barometric pressures in aviation in most countries. For example, the Meteorological Service of Canada

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