Atomic and nuclear properties of air (dry, 1 atm)
QuantityValueUnits ValueUnits
<Z/A> 0.49919 mol g-1   
Density (20° C, 1 atm) 1.205E-03 g cm-3   
Mean excitation energy 85.7 eV   
Minimum ionization 1.815 MeV g-1cm2 2.187E-03 MeV cm-1
Nuclear interaction length 90.1 g cm-2 7.477E+04 cm
Nuclear collision length 61.3 g cm-2 5.088E+04 cm
Pion interaction length 122.0 g cm-2 1.013E+05 cm
Pion collision length 88.5 g cm-2 7.348E+04 cm
Radiation length 36.62 g cm-2 3.039E+04 cm
Critical energy 87.92 MeV (for e-) 85.97 MeV (for e+)
Muon critical energy 1115. GeV   
Molière radius 8.83 g cm-2 7330. cm
Plasma energy ℏωp 0.71 eV   
Boiling point @ 1 atm 78.80 K -194.4 C
Index of refraction (0° C, 1 atm, Na D) 289. (n-1)x106     
Composition:
Elem ZAtomic frac*
A
Mass frac
C
6
0.00
12.0107
0.000124
N
7
0.76
14.0070
0.755267
O
8
0.23
15.9990
0.231781
Ar
 18
0.01
39.9480
0.012827
* calculated from mass fraction data

For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries