# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery, Division 3.3.1: Dry air and chemical species

Extent: E+W+S+N.I.

This section uses the following values for dry air composition:
x O2airdry = 0,209445 mol/mol
x Arairdry = 0,00934 mol/mol
x N2airdry = 0,78084 mol/mol
x CO2airdry = 375 μmol/mol
This section uses the following molar masses or effective molar masses of chemical species:
M air 28,96559 g/mol (dry air)
M Ar 39,948 g/mol (argon)
M C 12,0107 g/mol (carbon)
M CO 28,0101 g/mol (carbon monoxide)
M CO2 44,0095 g/mol (carbon dioxide)
M H 1,00794 g/mol (atomic hydrogen)
M H2 2,01588 g/mol (molecular hydrogen)
M H2O 18,01528 g/mol (water)
M He 4,002602 g/mol (helium)
M N 14,0067 g/mol (atomic nitrogen)
M N2 28,0134 g/mol (molecular nitrogen)
M NOx 46,0055 g/mol (oxides of nitrogen (*))
M O 15,9994 g/mol (atomic oxygen)
M O2 31,9988 g/mol (molecular oxygen)
M C3H8 44,09562 g/mol (propane)
M S 32,065 g/mol (sulphur)
M HC 13,875389 g/mol (total hydrocarbon (**))
This section uses the following molar gas constant R for ideal gases:
R = 8,314472J (mol · K)
This section uses the following ratios of specific heats γ [J/(kg · K)]/[J/(kg · K)] for dilution air and diluted exhaust:
γ air 1,399 (ratio of specific heats for intake air or dilution air)
γ dil 1,399 (ratio of specific heats for diluted exhaust gas)
γ exh 1,385 (ratio of specific heats for raw exhaust gas)

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.3/division/3.3.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.3/division-3.3.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.