- Binders
- Binding sites
- Bingham plastic
- Bioaccumulation
- Bioavailability
- Bioceramics
- Biochar
- Biocides
- Biocompatibility
- Biodiesel
- Biodiversity
- Biodiversity loss
- Biofilm
- Biofouling
- Biofuel
- Biogenic silica
- Biogenic sulfide corrosion
- Biogeochemical cycles
- Biogeochemistry
- Biohydrogen
- Biological activity
- Biological half-life
- Biological membranes
- Biomagnetism
- Biomagnification
- Biomarkers
- Biomass
- Biomaterials
- Biomimetics
- Biomineralization
- Biomolecules
- Biophysics
- Bioplastic
- Biopolymers
- Biopsy
- Bioremediation
- Biosynthesis
- Biot number
- Biot-Savart law
- Biotechnology
- Biotite
- Bioturbation
- Biphenyl
- Biplanes
- Bipyramid
- Birefringence
- Bischofite
- Biscuit
- Bismuth
- Bismutite
- Bisphosphonates
- Bistability
- Bisulfide
- Bit
- Bitmaps
- Bitumen
- Bituminous coal
- Black body
- Black carbon
- Black ice
- Black oxide
- Black silicon
- Black-body radiation
- Blackboard
- Blacksmiths
- Blade pitch
- Blade servers
- Blanket
- Blast furnace
- Bleach
- Bleeding
- Blimps
- Blockchain
- Blood
- Blood glucose monitoring
- Blood plasma
- Blood pressure
- Blood sugar level
- Blood transfusions
- Blood vessel
- Blood-brain barrier
- Blow molding
- Blower door
- Blowouts
- Blowtorch
- Blue baby syndrome
- Bluetooth
- Bluing
- Boat
- Body forces
- Boehmite
- Bogies
- Bohr effect
- Boiler water
- Boilers
- Boiling
- Boiling chips
- Boiling point
- Bollards
- Bolt
- Boltzmann constant
- Boltzmann equation
- Bond cleavage
- Bond energy
- Bond length
- Bond order
- Bond-dissociation energy
- Bone
- Bone density
- Bone marrow
- Bone sialoprotein
- Booster pump
- Borane
- Borate
- Borate glass
- Borate minerals
- Borax
- Borazine
- Borehole
- Boric acid
- Borides
- Boring
- Bornite
- Boron carbide
- Boron group
- Boron nitride
- Boron oxide
- Boron trichloride
- Boron trifluoride
- Boron trioxide
- Borosilicate glass
- Bose-Einstein Condensate
- Bosons
- Bottle
- Bottleneck
- Bottom ash
- Boulangerite
- Boundary layer
- Boundary value problems
- Bow
- Bowel obstruction
- Boyle's law
- Braces
- Bradycardia
- Bragg's law
- Braided
- Braided rivers
- Braiding machine
- Brain
- Brainstem