Small letters
dp	pressure gradient, Pa
r	pore radius, μm
Capital letters
A	Cross-sectional area of the porous material, m2
L	Path length of the porous material, m
Q	Volumetric flow rate, m3 s−1
K	Darcian permeability, m2
P	Pressure, MPa
Greek symbols
ρ	density of the fluid, g cm−3
μ	dynamic viscosity, kg m−1s−1
ε	porosity, %
ϒ	surface tension (interfacial energy) of mercury, N m−1
⍬	Contact angle of mercury with the material, deg.