what is 1 atm pressure

One standard atmosphere (atm) is a unit of pressure that is approximately equal to the average atmospheric pressure on Earth at mean sea level. It represents the force exerted by the entire column of air above a given point. Technically, 1 atm is precisely defined as 101,325 Pascals (Pa) or is equivalent to 1.01325 bar. This value is widely used as a standard reference for pressure across various scientific and practical applications.