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Suppose the density of air at Madras is ...

Suppose the density of air at Madras is `rho_0 and `atmosphere pressure is `P_0. If we go up the density and the pressure both decreae. Suppose we wish to calculate the pressure at a height 10 km above Madras. Ilf we use the equation `P_0-P=rho_0gz` will we get a pressure more than the actual or less than the actual? Neglect the variation in g. Does your answr change if you also consider the variation in g?

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