STP pe, ek mole koi bhi gas 22.4 litre jagah leta hai. Toh pehle gram ko mole mein badlo, molar mass se divide karke. Phir us mole ko 22.4 se multiply kar do, litre mil jaayega. Main bachhon ko yeh gaana sikhaata hoon: "mole-bole to twenty-two point four" taaki yaad rahe. Par mere liye, litre ka hisaab nebuliser ke saaman ke liye aata hai — ki yeh gas kitne din chalega. Woh practice zyada kaam aayi hai book waale sum se.
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