Defining variables: Properties of Ideal Gases as use case

From: https://pressbooks.bccampus.ca/thermo1/back-matter/properties-of-various-substances/#TG1

Use the above table to look-up the following properties of Air:

Gas constant (R)

C_p (heat capacity at const. pressure)

C_v (heat capacity at const. volume)

k (ratio of Cp and Cv)

#Air
R_air = 0.287 # kJ/kgK
Cp_air = 1.005 #kJ/kgK
Cv_air = 0.718 #kJ/kgK
k_air = 1.4

#Argon

### Please fill in here from looking into the above URL ###

R_argon = # kJ/kgK

Cp_argon = #kJ/kgK

Cv_argon = #kJ/kgK

k_argon = # unitless