Hectopascais

Hectopascais is the plural form of the hectopascal, a unit of pressure used in the International System of Units (SI). One hectopascal (abbreviated hPa) equals 100 pascals. The prefix hecto- denotes a factor of one hundred, so the hectopascal is a practical unit for atmospheric pressure in meteorology and aviation.

Hectopascals are commonly used to report atmospheric pressure. At sea level, standard pressure is about 1013 hPa (101325 Pa). In meteorology, pressures are typically given in hPa rather than pascals; conversions include 1 hPa = 0.1 kPa and 1 bar = 1000 hPa.

In Portuguese-language usage, the plural form hectopascais is used, while in English, the unit is typically referred to in the singular as hectopascal with the abbreviation hPa, though grammatically the symbol does not change with number. The unit name is distinct from the bar; 1 bar = 100000 Pa = 1000 hPa.

The hectopascal was adopted with the development of the SI system in the mid-20th century. It remains the standard unit in meteorology, climatology, and related fields for reporting atmospheric pressure.