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1 Atmosphere =

1,013.25 Millibars

(exact result)

An atmosphere of pressure, or atm, is the pressure exerted by the Earth's atmosphere at sea level. Since this number varies, a standard atmosphere is defined as 101,325 pascals.

A millibar is a unit of pressure equal to 1/1000^{th} of a bar, or 100 pascals. Barometric pressure readings are often given in millibars.