atmosphere data

[niko2000]

Hi!
I am doing a simple mathematical model of an airship. I need the data for air temperature, density and pressure for different altitudes. Could anyone give me any web address where I could find these data?
I am not native to this field, so I don't know how do these quantities change with altitude. I was thinking about doing an approximate formulas upon these data.
I would like to write a system of forces and then get a differential equation. In the end I could get a formula for heigh change.
Regards,
Niko

[enigma]

If you have access to a university library, you could check out "Introduction to Flight" by John Anderson. There is a full table of standard atmospheric values up to about 50km in both English and Metric units.

It's probably somewhere online, but I'm not sure where.

[Clausius2]

Hi!
I am doing a simple mathematical model of an airship. I need the data for air temperature, density and pressure for different altitudes. Could anyone give me any web address where I could find these data?
I am not native to this field, so I don't know how do these quantities change with altitude. I was thinking about doing an approximate formulas upon these data.
I would like to write a system of forces and then get a differential equation. In the end I could get a formula for heigh change.
Regards,
Niko

Type ''Standard Atmosphere Model'' in Google. You will obtain several tables of data and calculators on line.