kg/cm²

English · unit of pressure

Kilograms per square centimetre (kg/cm²) is an older pressure unit; the second fermentation of Champagne produces about 6 kg/cm².1,2

Where it appears

The Union des Maisons de Champagne uses it for the pressure built by the liqueur de tirage: about 24 g of sugar per litre plus yeast, giving roughly 6 kg/cm².1 Other sources give the same figure as about 6 bar at 20 °C.3

EU law uses bar; some specifications use atm.4,5 See prise de mousse and pressure.

A Champagne bottle is built to withstand 12 atmospheres (bottle pressure resistance).2

See also

CO2 and pressure in the bottleSciencePrise de mousseGlossaryLiqueur de tirageGlossarybarGlossaryatm (atmosphere)Glossary

Sources

  1. Union des Maisons de Champagne. Tirage or bottling the blended wine
  2. Union des Maisons de Champagne (UMC). Second fermentation: capturing the sparkle
  3. Comité Champagne (champagne.education). Fiche Élaboration du Champagne (FR) (2024-05)
  4. 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)
  5. 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)

Facts checked on 2026-10-19