Question: what is the average air pressure exerted by earth's atmosphere at sea level

title: Atmospheric pressure
text: Atmospheric pressure , sometimes also called barometric pressure , is the pressure within the atmosphere of Earth ( or that of another planet ) . In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point . As elevation increases , there is less overlying atmospheric mass , so that atmospheric pressure decreases with increasing elevation . Pressure measures force per unit area , with SI units of pascals ( 1 Pa = 1 N / m ) . On average , a column of air one square centimetre ( cm ) ( 0.16 sq in ) in cross-section , measured from sea level to the top of the Earth 's atmosphere , has a mass of about 1.03 kilograms ( 2.3 lb ) and weight of about 10.1 newtons ( 2.3 lb ) . That weight ( across one square centimeter ) is a pressure of 10.1 N / cm or 101 kN / m ( kPa ) . A column 1 square inch ( 6.5 cm ) in cross-section would have a weight of about 14.7 lb ( 6.7 kg ) or about 65.4 N . 

Answer: answer: The weight (across one square centimeter) is a pressure of 10.1 N / cm or 101 kN / m (kPa) atmospheric pressure, sometimes also called barometric pressure.
answer: On average , a column of air one square centimetre ( cm ) ( 0.16 sq in ) in cross-section , measured from sea level to the top of the Earth 's atmosphere , has weight of about 10.1 newtons ( 2.3 lb ) . That weight ( across one square centimeter ) is a pressure of 10.1 N / cm or 101 kN / m ( kPa ) .