Division 3.1 General requirements

Carbon monoxide (CO)

ρ = 1,25g/l

Carbon dioxide (CO₂)

ρ = 1,964g/l

Hydrocarbons:

for petrol (E10) (C₁H_1,93 O_0,033)

ρ = 0,646g/l

for diesel (B7) (C₁H_1,86O_0,007)

ρ = 0,625g/l

for LPG (C₁H_2,525)

ρ = 0,649g/l

for NG/biomethane (CH₄)

ρ = 0,716g/l

for ethanol (E85) (C₁H_2,74O_0,385)

ρ = 0,934g/l

Nitrogen oxides (NO_x)

ρ = 2,05g/l

The density for NMHC mass calculations shall be equal to that of total hydrocarbons at 273,15 K (0 °C) and 101,325 kPa, and is fuel-dependent. The density for propane mass calculations (see paragraph 3.5. in Sub-Annex 5) is 1,967 g/l at standard conditions.

If a fuel type is not listed in this paragraph, the density of that fuel shall be calculated using the equation given in paragraph 3.1.3. of this Sub-Annex.

ρ_{THC} = \frac{{MW}_{C} + \frac{H}{C} \times {MW}_{H} + \frac{O}{C} \times {MW}_{O}}{V_{M}}

where:

ρ_THC

is the density of total hydrocarbons and non-methane hydrocarbons, g/l;

MW_C

is the molar mass of carbon (12,011 g/mol);

MW_H

is the molar mass of hydrogen (1,008 g/mol);

MW_O

is the molar mass of oxygen (15,999 g/mol);

V_M

is the molar volume of an ideal gas at 273,15 K (0°C) and 101,325 kPa (22,413 l/mol);

H/C

is the hydrogen to carbon ratio for a specific fuel C_XH_YO_Z;

O/C

is the oxygen to carbon ratio for a specific fuel C_XH_YO_Z.