Question:ভূপৃষ্ঠে বা সমুদ্র সমতীরে বায়ুর সাধারণ চাপ কত? 

A `76cmHg` 
B `75cmHg` 
C `72kgm^-3` 
D `.6cmHg` 

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A 

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Md. Sohel Arman

Editor, VCampus

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