- back filling
- back interest
- back joint
- back land
- back loader
- back reef
- back silver
- back steam
- back stress
- back stroke
- back titration
- back wash
- back-mixing
- background concentration
- backing
- backing piece
- backing strip
- backup
- backwater value
- automatic ignition
- autopneumatolysis
- autopolymerization
- autorefrigeration
- autoxiddation
- azeotropic process
- azimuth circle
- azo derivative
- azote
- azote monoxide
- Babcock tube
- bacalite
- automobile oil
- Auverian stage
- avoirdupois system
- axial section
- axle grease
- azide
- bacterial corrosion
- bacteriological study
- bacteriology
- bad conductor
- badge column
- badger
- badlands
- baffle plate
- baffle ring
- bail
- bailer
- bailer value
- bailing
- bailing line
- bailing tub
- bainitic ferrite
- Bajocian stage
- bake
- bakelite
- baking
- baking enamel
- baking soda
- baking stove
- Balance sheet
- balanced reaction
- balancing machine
- balancing pressure
- balancing stand
- balas
- balata
- balau
- baled goods
- ball
- ball clay
- ball mill
- ball pump
- ball sealere
- ball test
- ball up
- balled iron
- balling
- balling drum
- balling furnace
- ballstone
- Balmer sreries
- balneological resources
- balsa
- banal slip
- banana oil
- Banbury mixer
- band brake
- band clamp
- band clutch
- band model
- banded
- banded clay
- banded coal
- banded limestone
- banded ore
- banded structure
- banding test
- bank
- base exchange