atm (atmosphere)

English · unit of pressure

The atmosphere (atm) is a pressure unit used in some specifications: Franciacorta Satèn, for example, may have at most 5 atm.1

Examples

  • Satèn from Franciacorta: at most 5 atm; it is sold only as brut.1
  • A Champagne bottle is built to withstand 12 atmospheres.2

EU law states its thresholds in bar: at least 3 bar for sparkling wine and 3.5 bar for quality sparkling wine at 20 °C.3 Another older unit is kg/cm². See pressure and bottle pressure resistance.

Inside a Champagne bottle the second fermentation produces about 6 bar at 20 °C.4,5

See also

CO2 and pressure in the bottleScienceSatènStylesbarGlossarykg/cm²Glossarybottle pressure resistanceGlossary

Sources

  1. Associazione Italiana Sommelier (reproduction of the official disciplinare). Disciplinare di produzione della DOCG Franciacorta (text as amended by DM 7.05.2024, GU n. 114 of 17.05.2024), reproduced by AIS (2024-05-17)
  2. Union des Maisons de Champagne (UMC). Second fermentation: capturing the sparkle
  3. legislation.gov.uk (copy of EU OJ text). Regulation (EU) No 1308/2013, Annex VII Part II (categories of grapevine products), original version as adopted (2013-12-17)
  4. Comité Champagne (champagne.education). Fiche Élaboration du Champagne (FR) (2024-05)
  5. Union des Maisons de Champagne. Tirage or bottling the blended wine

Facts checked on 2026-10-19