- birotation
- bisector
- bismuth spiral
- bispherical
- bistable
- bistable latch
- bistable relay
- bisync
- bisynchronous
- bit stealing
- black hole
- blackbody radiation
- blade
- blanching
- blanking pulse
- bimetallic instrument
- Bitter figure
- bivacancy
- black band
- blackbody emitter
- blackbody temperature
- blackening
- blast chamber
- block tariff
- blocked impedance
- blocking capacitor
- blood cooler
- bleeder
- blind
- Bloch band
- Bloch theorem
- Bloch wall
- block
- block condenser
- block freezing
- blocking action
- blood cooling
- blooming
- blower grid
- blowout
- blue
- blur
- bobbin insulator
- body cooling
- Bohr magneton
- boiler engineering
- boiler plant
- boiling mixture
- boiling number
- boiling refrigerant
- boiling region
- Boltzmann distribution
- Boltzmann engine
- bomb
- bomb blast
- bombarded
- bombarding
- bone conduction
- Boltzmann statistics
- bone vibrator
- booster fan
- boostrap
- boot
- Born approximation
- Bose superfluid
- both way
- bottle cooler
- bounce
- bound charge
- bound electron
- bound moisture
- boundary angle
- boundary pressure
- bounded
- bow collector
- blow
- blow back
- blower efficiency
- blower throat
- blurring
- BNC connector
- board insulation
- bobbin winding
- bode diagram
- bode plot
- body
- body capacitance
- body icing
- body-centered
- Bogolubov model
- Bohm diffusion
- boiler grate
- boiler room
- boiler-absorber
- boiling conditions
- boiling line
- boiling liquid
- boiling nitrogen
- bolometer
- bombard