Bar (unit) mb (rather than the proper mbar) to denote the millibar. Between 1793 and 1795, the word bar was used for a unit of weight in an early version of the metric system. Atmospheric air pressure is often given in millibars, where standard atmospheric pressure at sea level is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about . Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibars as the values are convenient. After the advent of SI units, some meteorologists began using hectopascals (symbol hPa) which are
ISO 3166-2:PA ISO 3166-2:PA ISO 3166-2:PA is the entry for Panama in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1. Currently for Panama, ISO 3166-2 codes are defined for 10 provinces and 3 indigenous regions. Each code consists of two parts, separated by a hyphen. The first part is , the ISO 3166-1 alpha-2 code of Panama. The second part is either of the following: The codes for the provinces are assigned in