ABS	Acrylonitrile Butadiene Styren
AC	Activated Carbons
ALPO	Aluminophosphate
AMDEA	Activated Methyl Diethanolamine
BET	Brunauer–Emmett–Teller
BRHF	Braid Reinforced Hollow Fiber Membranes
CA	Cellulose Acetate
CMS	Carbon Molecular Sieves
CNT	Carbon Nanotubes
DEA	Diethanolamine
DEF	N,N-Diethylformamide
DMAC	Dimethylacetamide
DMF	Dimethylformamide
FS	Fumed Silica
HF	Hollow Fibers
HMR	Homogeneous braid-reinforced
HTR	Heterogeneous braid-reinforced
KOH	Potassium hydroxide
LBM	Liquefied Biomethane
LNG	Liquefied Natural Gas
MBR	Membrane bioreactor
MDEA	Methyl Diethanolamine
MEA	Monoethanolamine
MF	Microfiltration
MMM	Mixed Matrix Membranes
MOF	Metal Organic Frameworks
NF	Nanofiltration
NMP	N-Methyl-2-Pyrrolidone
PAN	Polyacrylonitrile
PC	Polycarbonate
PDMS	Polydimethylsiloxane
PEBAX	Polyether block amide
PEG	Polyethylene Glycol
PES	Polyethersulfone
PET	Polyethylene Terephthalate
PI	Polyimide
PMIA	Poly(m-phenylene isophthalamide)
PMO	Periodic Mesoporous Organosilica
PSA	Pressure Swing Adsorption
PSF	Polysulfone
PTFE	Polytetrafluoroethylene
PTMSP	Poly(1-trimethylsilyl-1-propyne)
PVC	Polyvinyl Chloride
PVDF	Polyvinylidene fluoride
PVP	Polyvinylpyrrolidone
PZ	Piperazine
RO	Reverse Osmosis
RTO	Regenerative Thermal Oxidation
SAPO	Silico-Alumino-Phosphate
TFC	Thin Film Composite
TIPS	Thermally Induced Phase Inversion
UF	Ultrafiltration
ZIFs	Zeolite immidazolate frameworks
Q	Dope solution feed rate (ml/min)
$\rho$	dope solution density
$\vartheta$	braid advancing speed
Do	braid outer diameter
T	Dope solution thickness
A	pre-exponential factor, i.e., weakly dependent upon temperature
V*	minimum free volume element size that could accommodate penetrant molecules
$\gamma$	overlap factor introduced in order to prevent double counting free volume
Vf	average free volume in media that is accessible to transport of penetrants