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The equation for real gas is given by ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + 2 V a P (V – b) = RT, where P, V, T and R the pressure, volume, temperature and gas constant, respectively. The dimension of ab –2 is equivalent to that of :

1. Strain
2. Compressibility
3. Planck’s constant
4. Energy density

Correct answer: Energy density

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