The density of the atmosphere is $1.29\, kg/m^3$, then how high would the atmosphere extend ? $(g = 9.81\, m/sec^2)$ ........ $km$
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$\mathrm{P}=\rho\ell \mathrm{g}$
$1.013 \times 10^{5}=1.29 \times \ell \times 9.81$
$\ell=8 \mathrm{km}$
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