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January 28, 2015

January 28, 2015

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

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.

- Astronomy -
**drwls**, Thursday, April 9, 2009 at 6:11amYou don't need to know the Venus data to answer this problem.

The TOTAL CO2 on Earth is

(Earth area)*10^4 m*(air density)*3.5*10^-4,

assuming 3.5*10^-4 is the mass fraction of CO2. That is obsolete data, and whoever provided the problem should have stated if it was a mass or volume fraction.

Actually, 3.8^10^-4 is the current mole or volume fraction of CO2. The value of the present CO2 MASS fraction is 5.8*10^-4

You will need the Earth's surface area to complete the problem.

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