atmosphere

https://doi.org/10.1351/goldbook.A00490
Non-SI unit of pressure, 1 atm = 101,325 Pa.
Sources:
Green Book, 2nd ed., p. 112 (https://dev.goldbook.iupac.org/files/pdf/green_book_2ed.pdf)
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2175 (https://doi.org/10.1351/pac199062112167)
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 962 (https://doi.org/10.1351/pac199668040957)