Atmospheric pressure refers to the force exerted by the weight of air molecules in the atmosphere on a given area. It decreases with altitude, as there are fewer air molecules at higher elevations. Standard atmospheric pressure at sea level is approximately 101.3 kPa or 760 mmHg. Atmospheric pressure plays a significant role in various weather patterns and phenomena, affecting wind and precipitation. It is also crucial in determining the boiling point of liquids, influencing both cooking and industrial processes, and is a key consideration in multiple scientific disciplines such as meteorology and aviation.