Standard sea level pressure in millibars is
A. Standard sea level air pressure is 1013 mb (millibars), which is the same as 29.92 inches of mercury or 14.7 pounds per square inch. 2. Mercury is 13 times heavier than water.. Standard sea level pressure in centimeters equals 76 cm of mercury. Thus, the height of standard sea level pressure if a water barometer is used would be 13 times higher, or 988 cm. 3. Describe the principle of the aneroid barometer.