| ballistic galvanometer |
| band theory of solids | |
| bar | | |
| barometer | |
| beats | |
| Bernoulli's equation | |
| beta decay | |
| binding energy | |
| Biot and savart law | |
| blackbody | |
| bolometer | |
| Boltzmann's constant | |
| Boltzmann's theorem | |
| bondinng in atoms | |
| bosons | |
| Boyle's temperature | |
| Bragg's law | |
| bremsstrahlung | |
| Brownian movement | |
| bubble chamber | |