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At the top of a mountain a thermometer reads \( 7^{\circ} \mathrm{C} \) and a barometer reads \( 70 \mathrm{~cm} \) of \( \mathrm{Hg} \). At the bottom of the
\( \mathrm{P} \) mountain these read \( 27^{\circ} \mathrm{C} \) and \( 76 \mathrm{~cm} \) of \( \mathrm{Hg} \) respectively.

W Comparison of density of air at the top with that of bottom is
(a) \( 75 / 76 \)
(b) \( 70 / 76 \)
(c) \( 76 / 75 \)
(d) \( 76 / 70 \)
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