Which unit of pressure is commonly used by meteorologists?

Explanation

Option D is correct since Meteorologists use a metric unit for pressure called a millibar and the average pressure at sea level is 1013.25 millibars. Option A is incorrect since standard atmosphere (atm) is mainly used as a reference value for the average atmospheric pressure at sea level. It is often used to indicate the depth rating for a water-resistant watch but is rarely used as a unit for measuring pressure. Option B is incorrect since the pascal is used to measure sound pressure. Option B is incorrect since even though mm of Hg is not an SI unit, it is still routinely used in medicine, meteorology, aviation, and many other scientific fields.