# Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel CNG ? Why or why not ?

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Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel CNG ? Why or why not ?

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Hydrogen is a cleaner fuel than CNG. This is due to the reason that it produces water on burning whereas CNG on burning produces CO_2, though much less than that produced when coal or oil is burnt. A spaceship carries oxygen (in liquid form) along with it to burn hydrogen (in liquid form) as a fuel.