The standard unit for measuring atmospheric pressure is the pascal (Pa). One pascal is defined as one newton per square meter and is a part of the International System of Units (SI). Atmospheric pressure is typically measured in terms of hectopascals (hPa) or kilopascals (kPa), where 1013.25 hPa is equivalent to standard atmospheric pressure at sea level. In meteorology, atmospheric pressure can also be expressed in millibars (1 hPa = 1 mb). Measuring atmospheric pressure is crucial for weather forecasting, understanding climatic changes, and studying various physical phenomena in the atmosphere.