The unit of measure for atmospheric pressure is the Pascal (Pa). Another commonly used unit is millimeters of mercury (mmHg). At sea level, standard atmospheric pressure is approximately 101,325 Pa, which is equivalent to 760 mmHg. Other units like atmospheres (atm) and bar are also used, where 1 atm is equal to 101,325 Pa. Atmospheric pressure is crucial for weather patterns and influences various biological processes.