The equation ( P + a/V^2) (V - b) constant

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The equation $\left( {P + \frac{a}{{{V^2}}}} \right)$ $(V - b)$ constant. The units of $a$ are

A

$Dyne \times c{m^5}$

B

$Dyne \times c{m^4}$

C

$Dyne/c{m^3}$

D

$Dyne/c{m^2}$

The equation $\left( {P + \frac{a}{{{V^2}}}} \right)$ $(V - b)$ constant. The units of $a$ are

Units of $a$ and $PV^2$ are same and equal to dyne $×$ $cm^4$.