Millibars are a unit of pressure commonly used in meteorology to measure atmospheric pressure. One millibar is equal to 100 pascals, which is a standard unit of pressure in the International System of Units (SI). Atmospheric pressure at sea level is typically around 1013.25 millibars, and this value can change with weather conditions. Meteorologists use millibars to analyze weather patterns and predict changes in the atmosphere. For example, low-pressure systems, often associated with storms, can be around 980 millibars or lower, while high-pressure systems, which usually bring clear skies, can be around 1020 millibars or higher. Understanding these measurements helps in forecasting weather events.