By composition, I meant quantity of each gas.DrStupid said:You need the mass of the atmosphere.
If you know the total mass of each gas separately then you know the total mass of all the gasses put together.The Exestentialist said:By composition, I meant quantity of each gas.
In what units? I tried this with Earth's atmosphere and I didn't get the right answer.Chestermiller said:To get the pressure at the surface, which is usually referred to as the atmospheric pressure, just divide the weight of the atmosphere mg by the total surface area of the planet.
What units did you use for the weight of the Earth's atmosphere and the surface area of the planet and what answer did you get?The Exestentialist said:In what units? I tried this with Earth's atmosphere and I didn't get the right answer.
I used 5.1x1018 kg for the atmosphere's weight and 4*π*12,742,0002 m2 for the surface area of the Earth. I got 2,499,684 kg/m2jbriggs444 said:What units did you use for the weight of the Earth's atmosphere and the surface area of the planet and what answer did you get?
Check your arithmetic and check your figure for the radius of the Earth in meters. I get around 11,000 kg/m2 on the back of an envelope.The Exestentialist said:I used 5.1x1018 kg for the atmosphere's weight and 4*π*12,742,0002 m2 for the surface area of the Earth. I got 2,499,684 kg/m2
PaThe Exestentialist said:In what units? I tried this with Earth's atmosphere and I didn't get the right answer.
Don't forget to multiply by g.jbriggs444 said:Check your arithmetic and check your figure for the radius of the Earth in meters. I get around 11,000 kg/m2 on the back of an envelope.
Edit: 7 significant figures of computed output on an input that is only stated to 2 digits reflects more precision than is justified.
I was assuming kilograms-force, but yes, I agree.Chestermiller said:Don't forget to multiply by g.
Atmospheric pressure is the force per unit area exerted by the weight of Earth's atmosphere above a given point.
Atmospheric pressure is commonly measured using a barometer, which measures the height of a column of mercury or other liquid in a tube.
The SI unit for atmospheric pressure is pascal (Pa), but it is often measured in other units such as millibar (mb) or inches of mercury (inHg).
As altitude increases, atmospheric pressure decreases. This is because there is less air above a given point at higher altitudes, resulting in lower pressure.
Atmospheric pressure can be calculated using the ideal gas law, which relates pressure, volume, temperature, and the number of gas molecules. It can also be calculated using weather data such as temperature and altitude.