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Symbol	Description	Units
f_φ	Fraction of initial pore space filled	length³/length³
f_mass,k	Mass fraction of k^th mineral component	g k/g total solid
f_V,k	Volume fraction of the k^th phase	length³/length³
Nⁱ_k	Moles of species i in phase k	Moles
ρ_k	Density of phase k	mass/length³
^p/qr	Isotopic ratio of nuclides p and q
Xⁱ_s	Mole fraction of species i in the s^th	mol i/mol mixture

Units are generic where possible: length indicates a unit of length (cm, m, km), mass a gram-based units of mass (g or kg), and time a unit of time (e.g., years, a (annum or annorum) and millions of year, Ma). Moles are specifically denoted.

Fantle Research Group at Penn State