The density of the atmosphere at sea level is $1.29 \;kg / m ^{3} .$ Assume that it does not change with altitude. Then how high (in $km$) would the atmosphere extend?
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$\rho g h=1.29 kg m ^{3} \times 9.8 m s ^{2} \times h m =1.01 \times 10^{5} Pa$
$ \therefore h=7989\, m \approx 8 \,km$
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