Value for tau molar mass
type: ConstantValue
has unit: KiloGM-PER-MOL
informative reference: http://physics.nist.gov/cuu/Constants/bibliography.html
standard uncertainty: 0.00000031
standard uncertainty SN: 3.1E-7
value: 0.00190768
value SN: 1.90768E-3
website: http://physics.nist.gov/cgi-bin/cuu/Value#mid