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August 31, 2015

Homework Help: Astronomy

Posted by Ashley on Thursday, April 9, 2009 at 1:38am.

Atmospheric pressure is simply the weight (remember Newton’s Laws) of the atmosphere pushing down
divided by the area upon which the atmosphere is pushing. The metric units of pressure are Newtons/m2
(also called a Pascal; you might also have heard of pounds per square inch [PSI], which is the English units
equivalent).
The surface (atmospheric) pressure on Venus is around 90 bars (surface pressure on the Earth is 1 bar, by
definition). Venus’ atmosphere is 96% CO2, compared to 0.035% in the Earth’s atmosphere. How much CO2
is in the Earth’s atmosphere? To simplify this calculation, you can assume that the Earth’s atmosphere is
uniformly dense and has a height of 10 km (this is the Earth’s atmospheric scale height.). The density of air
is around 1 kg/m3.

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