<P> The average atmospheric pressure at sea level is defined by the International Standard Atmosphere as 101325 pascals ( 760.00 Torr ; 14.6959 psi ; 760.00 mmHg ) . This is sometimes referred to as a unit of standard atmospheres ( atm ) . Total atmospheric mass is 5.1480 × 10 kg ( 1.135 × 10 lb ) , about 2.5 % less than would be inferred from the average sea level pressure and Earth 's area of 51007.2 megahectares , this portion being displaced by Earth 's mountainous terrain . Atmospheric pressure is the total weight of the air above unit area at the point where the pressure is measured . Thus air pressure varies with location and weather . </P>
<P> The average atmospheric pressure at sea level is defined by the International Standard Atmosphere as 101325 pascals ( 760.00 Torr ; 14.6959 psi ; 760.00 mmHg ) . This is sometimes referred to as a unit of standard atmospheres ( atm ) . Total atmospheric mass is 5.1480 × 10 kg ( 1.135 × 10 lb ) , about 2.5 % less than would be inferred from the average sea level pressure and Earth 's area of 51007.2 megahectares , this portion being displaced by Earth 's mountainous terrain . Atmospheric pressure is the total weight of the air above unit area at the point where the pressure is measured . Thus air pressure varies with location and weather . </P>
what is the weight of the air on the earth 's surface called
what is the weight of the air on the earth 's surface called
Atmospheric pressure
Atmospheric pressure