It's not. Standard atmospheric pressure at sea level is 101 325 Pa. The SI unit of pressure is the pascal (Pa). One pascal is just one newton per square metre. The bar is not an SI unit. It is defined as: 1 bar = 100 000 Pa. So, standard atmospheric pressure at sea level is 1.01325 bar. read more
1 bar = 100 000 Pa. So, standard atmospheric pressure at sea level is 1.01325 bar. The only convenient thing about the bar is that one bar is roughly equal to normal atmospheric pressure and one is a nice easy number. read more
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. read more
Atmospheric pressure varies constantly at the earths surface with changes in the weather. Typically it varies between 980 and 1030 hectopascals at sea level. As you go higher up the terrain away from sea level the atmospheric pressure reduces at a rate of around 1 hectopascal for every 30 feet of elevation. read more
Standard atmospheric pressure at sea level is 101 325 Pa. The SI unit of pressure is the pascal (Pa). One pascal is just one newton per square metre. The bar is not an SI unit. It is defined as: 1 bar = 100 000 Pa. So, standard atmospheric pressure at sea level is 1.01325 bar. read more