Hectopascal

The hectopascal (hPa) is a metric unit of pressure equal to one hundred pascals, and it serves as the standard measure for atmospheric pressure in meteorology, aviation, and climate science; its concise symbol “hPa” makes it ideal for weather maps, forecasts, and scientific publications, where it replaces the older millibar (1 hPa = 1 mbar) for greater consistency with the International System of Units (SI). By quantifying the force exerted by the air column above a given point, the hectopascal provides a clear, comparable scale for tracking high‑ and low‑pressure systems, assessing storm intensity, and calibrating instruments such as barometers and pressure sensors. Its widespread adoption in practical applications—from daily weather reports to advanced climate modeling—highlights the hectopascal’s essential role in both everyday life and rigorous scientific research.