A hectopascal (hPa) is a unit of pressure commonly used in meteorology. It is equal to 100 pascals, which is the SI unit for pressure. The term "hecto" means one hundred, so a hectopascal represents a pressure of 100 newtons per square meter. Hectopascals are often used to report atmospheric pressure, such as in weather forecasts. Standard atmospheric pressure at sea level is approximately 1013.25 hPa. This measurement helps meteorologists understand weather patterns and predict changes in the atmosphere, making it essential for forecasting and climate studies.