# Molecular weights from https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses.
# Density souce: https://physics.nist.gov/PhysRefData/XrayMassCoef/tab2.html
# Material composition source: same as density

# Material name:
# water

# Number of elements:
2

# Density:
1.000000

# Atomic number(s) and corresponding mass fraction(s):
1    0.111902    # hydrogen
8    0.888098    # oxygen
