ecuatia reactiei de ardere in aer(20%O2 si 80%N2)
CH4 + 2O2 +4X2N2---> CO2 + 2H2O + 8N2
1vol...................................1vol 2vol.......8vol
total gaze rezultate: 9 volume
9 vol.amestec.............8 volN2
100........................x%=..........................calculeaza !!!!