The average atmospheric pressure at sea level is exactly 1013.25 millibars. This value represents the standard weight of the entire column of air above a single point at sea level. It is also equivalent to 760 millimeters of mercury or one “atmosphere” of pressure. Meteorologists use this standard figure as a baseline for measuring and comparing weather systems. ANSWER: (D) 1013.25 millibars
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Atmospheric pressure is the force exerted by the weight of the air above us. At sea level, this force averages out to 1013.25 millibars (mb). This specific measurement is known as “Standard Sea Level Pressure.” It serves as a vital reference point for barometric readings; values higher than this usually indicate clear, stable weather (High Pressure), while values below this often suggest approaching storms or rain (Low Pressure). Because pressure decreases predictably with altitude, pilots and mountaineers use this sea-level standard to calibrate altimeters and determine their height above the Earth’s surface accurately
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