Millibaarit

Millibaarit is the Finnish plural form of millibar, a unit of atmospheric pressure commonly used in meteorology. A millibar is equal to one hectopascal and equals 100 pascals. Although the SI unit of pressure is the pascal, millibars (mb) and hectopascals (hPa) have long been used in weather reports and climate data because the numbers are convenient for describing atmospheric pressure at sea level.

Usage and history: Historically, weather observations in many countries reported pressure in mb. With the adoption of SI, many meteorological agencies shifted to hPa or Pa, but mb remains widely understood and still appears in historical datasets, weather maps, and Finnish-language materials. The plural form in Finnish, millibaarit, is used when referring to multiple millibars.

Relation to other units: 1 mb equals 1 hPa equals 100 Pa equals 0.1 kPa. Standard sea-level pressure is about 1013 mb (roughly 1013 hPa). Differences of a few millibars correspond to typical weather changes; a fall of tens of millibars signals stronger systems such as storms or depressions.

Notes on usage: In modern SI usage, pascals are preferred, but in meteorology hPa remains a common unit, and mb is still encountered in historical data and Finnish-language contexts. The term millibaarit appears mainly in Finnish-language discussions and older international literature, where the equivalent measures are often given as hPa or Pa.