The approximate volume of Mars atmosphere is 20211994724 km³
To find the approximate volume of Mars atmosphere, we first need to find its surface area and then multiply it by the thickness of the atmosphere.
Since Mars is a sphere, its surface area A = 4πr² where r = radius of mars = d/2 where d = diameter of Mars. So r = 6779 km/2 = 3389.5 km
So, A = 4πr²
A = 4π(3389.5 km)²
A = 4π × 11488710.25 km²
A = π × 45954841 km²
A = 144371390.883 km²
Since the atmosphere is t = 140 km thick, the volume of Mars atmosphere is V = At
V = 144371390.883 km² × 140 km
V = 20211994723.55 km³
V = 20211994724 km³ to the nearest cubic kilometer
So, the approximate volume of Mars atmosphere is 20211994724 km³
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