Question: what is the difference between rich and lean gas?
Answer: The difference between them is their calorific value, i.e. a different quantity of energy. In other words, 1 m³ of lean gas provides less energy than 1 m³ of rich gas. ... Rich gas contains an average of 11.4 kWh per m³ Lean gas contains an average of 10.3 kWh per m³