The calorific value (calories) of propane in LPG is approximately 24,000 kcal/m 3 and butane is approximately 32,000 kcal/m 3 , and the calorific value of methane, the main component of LNG, is approximately 9,700 cal/m 3 , which is more than twice as much in LPG. What is the calorific value of propane? Burning 1 m 3 of gaseous propane produces 99 mj (24,000 kcal), and 1 m 3 of butane produces 128 mj (31,000 kcal). Comparing the calorific value of propane gas and city gas, propane gas => 24,000kcal/m 3 and city gas => 11,000kcal/m 3 . Propane gas has a calorific value approximately 2.18 times better than city gas.
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