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A flask of volume \( V \) is partially filled with mercury. It is found that at different room temperature, the
P volume of air inside the flask remains the same. If \( \gamma_{g} \) and \( \gamma_{m} \) are the coefficient of cubical expansion of
W glass and mercury respectively, the volume of mercury in the flask is
(1) \( \frac{\gamma_{g} V}{\gamma_{m}} \)
(2) \( \frac{\gamma_{m} V}{\gamma_{g}} \)
(3) \( \left(1-\frac{\gamma_{g}}{\gamma_{m}}\right) V \)
(4) \( \left(1-\frac{\gamma_{m}}{\gamma_{g}}\right) V \)
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