| Petroleum Gas | Natural Gas |
| 1. Petroleum gas contains higher concentration of butane and propane. | Natural Gas contains higher concentration of methane in it. |
| 2. Petroleum gas like LPG has higher calorific value [approx. 94J/m3]. | Natural Gas has lower calorific value [approx. MJ/m3]. |
| 3. Petroleum Gas is a constituent of crude oil. | Natural gas is not at all a constituent of crude oil and it is found above the crude oil deposit. |
| 4. Petroleum Gas is harmful to the environment as it causes a large amount of emission of carbon dioxide. | Natural Gas is safer to for the environment as it emits very less amount of carbon dioxide in the atmosphere as compared to petroleum gas. |
