- balancing
- ball
- ball manipulator
- ballast
- ballooning instability
- bamboo effect
- band
- base fog
- base frame
- basis vector
- battery grip
- battery pack
- battery terminal
- bayonet closure
- beam diameter
- beam injection
- beam pulser
- beam reactor
- bar feed
- bar linkage
- barogram
- barometrical
- barotropic fluid
- Bartlett force
- bearer
- beat
- bellows camera
- bellows extension
- bellows frame
- bare
- bare particle
- bare reactor
- BARITT diode
- barograph
- barometer
- barometric
- baroscope
- barothermograph
- barotrauma
- barrel
- base design
- base frequency
- base power
- base scratch
- basin
- Basov diagram
- batch evaporation
- bayonet mount
- bayonet socket
- bead screen
- beaker holder
- batch distillation
- batch extraction
- batching tank
- battery viewer
- bayonet locking
- BCS theory
- bearing pad
- become zero
- bell
- bellows attachment
- bellows pump
- Beltrami flows
- benchmark
- Berthelot equation
- beta emitter
- beta rays
- beta-active
- beta-spectrometer
- betatron
- betatron motion
- bias
- bias voltage
- biaxial
- biconcave
- biconvex
- Biicheer funnel
- Biichner flask
- binaural effect
- biological shield
- biomechanics
- biomedical nanotechnology
- bioMEMS
- biomimetic chemistry
- biomimetic materials
- biomimetics
- biophysics
- birefringent
- birefringent medium
- blacken
- blackened
- blank groove
- blanket gas
- binaural audition
- blazing
- blower brush
- blue goo
- blocking effect
- blocking voltage
- blooming