Units error in COESA amtospheric models

[jorgepiloto]

🐞 Problem

I just noticed that the universal gas constant defined in both coesa62.py and coesa76.py hold wrong units: they make use of u.J / u.kg / u.K while proper units should be u.J / u.kmol / u.K. Though defined with wrong units, no errors were raised since code does not make use of those variables.

poliastro/src/poliastro/earth/atmosphere/coesa62.py

Line 76 in 817fac9

R = 8314.32 * u.J / u.kg / u.K

poliastro/src/poliastro/earth/atmosphere/coesa76.py

Line 55 in 817fac9

R = 8314.32 * u.J / u.kg / u.K

When the universal gas constant is divided by the mean molecular weight of the gas (with u.kg / u.kmol), the specific gas constant is obtained with units u.J / u.kg / u.K.

💡 Possible solutions

Either delete de variables or correct their units will solve for this problem.

[rafaellehmkuhl]

I will send a PR for this one.