Question

please give a answer please help me please plzplzplzplzplz
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Answer 1

Answer:

Air contains less oxygen as compared to Pure oxygen and for welding we need too much oxygen to burn

Explanation:

Answer 2

Hey mate ,

here is ur answer

Ethane is burnt in air incomplete burning that hand takes place and also produces sooty flame due to the limited supply oxygen present in the air. Due to this reason a mixture of ethane and air is not used for welding