China 
Africa 
- Gas kinetics
- Gas lasers
- Gas law
- Gas leaks
- Gas lift
- Gas lighter
- Gas lighting
- Gas mantles
- Gas metal arc welding
- Gas meter
- Gas oil ratio
- Gas porosity
- Gas protection
- Gas reinjection
- Gas sensors
- Gas separation
- Gas slug
- Gas spring
- Gas thermometer
- Gas turbine modular helium reactor
- Gas turbines
- Gas vesicles
- Gas-assisted injection molding
- Gas-cooled fast reactor
- Gas-cooled reactor
- Gas-fired power plant
- Gas-generator cycle
- Gas-liquid contactor
- Gaseous diffusion
- Gaseous signaling molecules
- Gasification
- Gaskets
- Gasohol
- Gasoline
- Gasotransmitters
- Gastric acid
- Gastric glands
- Gastric lavage
- Gastric lymphoma
- Gastric mucosa
- Gastric outlet obstruction
- Gastric varices
- Gastrin
- Gastritis
- Gastrocnemius
- Gastrocnemius muscle
- Gastroenteritis
- Gastroenterology
- Gastroesophageal reflux disease
- Gastrointestinal bleeding
- Gastrointestinal cancer
- Gastrointestinal disease
- Gastrointestinal motility
- Gastrointestinal tract
- Gastroparesis
- Gastroscopy
- Gastrostomy
- Gasworks
- Gate array
- Gate capacitance
- Gate count
- Gate dielectric
- Gate drivers
- Gate equivalents
- Gate fee
- Gate oxide
- Gate turn-off thyristor
- Gate valves
- Gateway
- Gating
- Gato
- Gaucher's disease
- Gauge
- Gauge blocks
- Gauge covariant derivative
- Gauge factor
- Gauge fixing
- Gauge group
- Gauge symmetry
- Gauge theory
- Gault
- Gault clay
- Gauss map
- Gauss's law
- Gaussian
- Gaussian beam
- Gaussian blur
- Gaussian curvature
- Gaussian elimination
- Gaussian filter
- Gaussian function
- Gaussian integers
- Gaussian optics
- Gaussian processes
- Gaussian quadrature
- Gaussian surface
- Gauze
- Gawler Craton
- Gaze
- Gazebo simulator
- Gcov
- GeForce
- Geant4
- Gear
- Gear cutting
- Gear manufacturing
- Gear oil
- Gear pumps
- Gear ratio
- Gear shaping
- Gear stick
- Gear train
- Gearboxes
- Geared turbofan
- Geary's C
- Gecko feet
- Gefitinib
- Geiger counters
- Geiger-Marsden experiment
- Geikielite
- Gel doc
- Gel electrophoresis
- Gel point
- Gelatin
- Gelatinase
- Gelatinase A
- Gelation
- Gelcoat
- Geldanamycin
- Gellan gum
- Gels
- Gemba
- Geminal
- Geminal diols
- Gemstones
- Gene
- Gene amplification
- Gene cassettes
- Gene clusters
- Gene co-expression networks
- Gene conversion
- Gene delivery
- Gene dosage
- Gene drives
- Gene duplication
- Gene expression
- Gene expression profiling
- Gene expression programming
- Gene family
- Gene knock-in