# Molecular weights from https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses.
# Density source: NCAT software distribution
# Material composition source: same as density

# Material name:
# NCAT air

# Number of elements:
4

# Density:
0.001205

# Atomic number(s) and corresponding mass fraction(s):
6    0.000124    # carbon
7    0.755268    # nitrogen
8    0.231781    # oxygen
17    0.012827    # chlorine
