How identify Nitrogen gas ya Refrigerant gas

Maine ek AC Mai nitrogen gas Dali hai,
Ek AC Mai Oxygen gas Dali hai,
Nd I forget ki Konse AC Mai Maine Nitrogen Dali hai konse Mai oxygen
Kaise Patta kre
Expampele
Outdoor par 500psi ka gej laga kar band ac me outdoor ke candensar par garm pani dalo aur dekho ki praser kam ya jayda ho raha hai kya
Agar praser kam ya jayda nahi ho raha hai to wo nitrogen ges hai

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