(P + a/(V²))(V - b) = RT represents the equation of state of some gases, where P is the pressure, V is the volume, T is the temperature and a, b, R are constants. The physical quantity which has the same dimensional formula as (b²)/a will be

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(2) Compressibility. Every term added to P must itself be a pressure, so [a/(V²)]=[P], giving [a]=[P][V²]. Every term subtracted from V must be a volume, so [b]=[V]. [(b²)/a]=([V]²)/([P][V]²)=1/([P]). A reciprocal pressure is compressibility, the reciprocal of bulk modulus.

(P + a/(V²))(V - b) = RT represents the equation of state of some gases, where P is the pressure, V is the volume, T is the temperature and a, b, R are constants. The physical quantity which has the same dimensional formula as (b²)/a will be

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Why the other options are wrong