Terms of the encyclopedia of physics beginning with B: 61.
- Ballistic galvanometer
- Balmer series
- Bar
- Bar (mechanics)
- Barkhausen effect
- Barn
- Barnett effect
- Barotropic phenomenon
- Baryon charge
- Baryons
- Beats
- Becke method
- Becquerel
- Bel
- Bernoulli equation (the Bernoulli integral)
- Beta decay
- Beta-particles
- Beta-spectrometer
- Betatron
- Biaxial crystals
- Binaural effect
- Binocular vision
- Binoculars
- Biological crystals
- Bioluminescence
- Biot-Savart law
- Biot's law
- Bit
- Black body
- Bloch–Grüneisen formula
- Bloch's law
- Bohr magneton
- Bohr radius
- Bohr–Van Leeuwen theorem
- Bohr's postulates
- Bolometer
- Boltzmann constant
- Boltzmann distribution
- Boltzmann statistics
- Born approximation
- Bose gas
- Bose liquid
- Bose particle
- Bose–Einstein condensation
- Bose–Einstein distribution
- Bose–Einstein statistics
- Boson (Bose particle)
- Bouguer-Lambert-Beer law
- Boyle point
- Boyle–Mariotte law
- Brackett series
- Bragg-Wulff condition
- Braunian motion
- Bravais lattices
- Breeder (breeder reactor)
- Breit-Wigner formula
- Brewster angle
- Brewster's law
- Brillouin zone
- Brownian motion (Braunian motion)
- Burstein-Moss effect