The major combustible component of gobar (cow- dung) gas is

Gobar gas, also known as biogas, is produced through the anaerobic decomposition of organic matter like cattle dung [2]. It is primarily composed of methane (CH4) and carbon dioxide (CO2) [t2][t8]. Methane is the major combustible component, typically making up 50% to 75% of the gas by volume [t1][t3][t4]. While carbon dioxide is a significant constituent (30-50%), it is non-combustible and actually reduces the flame temperature [t4][t6]. Other gases like hydrogen (H2) and nitrogen (N2) are present only in trace amounts, usually less than 10% and 2% respectively [t3][t7]. Methane's high concentration and chemical properties make it the primary fuel source in biogas, providing the thermal efficiency required for cooking and lighting in rural areas [c1][c4][t5]. Propane is not a standard constituent of biogas produced from animal waste.

Sources

1. [1] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > Biogas > p. 117
2. [2] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 60