| galaxy |
| galilean transformations | |
| galvanometer | | |
| gamma rays | |
| gas laws | |
| gauss | |
| gauss flux theorem | |
| geiger mueller counter | |
| generator | |
| geometrical optics | |
| geostationary orbit | |
| gibb's free energy | |
| glow discharge | |
| graham's law of diffusion | |
| gram | |
| green house effect | |
| grey |
