The millibar (symbol mbar) is a metric unit of pressure equal to one‑hundredth of a kilopascal and is commonly used to express atmospheric pressure, weather patterns, and altitude‑related forces; it provides a convenient scale for meteorologists, pilots, and scientists because its values closely match everyday pressure readings (e.g., standard sea‑level pressure is about 1013 mbar). By quantifying the weight of the air column above a given point, the millibar enables accurate forecasting, aviation navigation, and climate research, making it an essential measurement in both practical applications—such as storm tracking and flight planning—and scientific investigations of atmospheric dynamics.