- experimental evidence
- explosion hazard
- exponential absorption
- extension cord
- extensive
- extensometer
- external gauge
- extract air
- extrinsic
- expectation value
- experimental conditions
- experimental error
- experimental information
- exploring coil
- explosion pot
- explosion-proof
- explosive reaction
- exponential horn
- expose surfaces
- extended surface
- extensibility
- extension line
- external cooling
- external work
- extract grille
- extraction
- extreme
- extrinsic absorption
- extrinsic photoconductive
- eye diagram
- eye estimation
- face centered
- faceplate controller
- facet
- fading
- Fahrenheit temperature
- false call
- fan characteristic
- fan control
- fan cooling
- fan diffuser
- fan motor
- fan performance
- fan section
- fan shroud
- fan stage
- fan system
- fan unit
- fanning action
- fanning beam
- Fanno flow
- Fanno line
- far-infrared
- Faraday effect
- Faraday generator
- Farb center
- fast hardener
- fast melting
- fast mode
- fast rectifier
- fast response
- fata morgana
- fatal
- fatigue failure
- fatigue fracture
- fault detector
- fault finder
- fault recorder
- faure plate
- feather valve
- feed
- feed circuit
- feed control
- feed end
- feed header
- feed nozzle
- feed point
- feedback amplifier
- feedback control
- feedback current
- feedback gain
- feedback loop
- feedback signal
- feedback system
- feeder reactor
- feedforward control
- feedthrough capacitor
- feedwater softening
- feeder panel
- feeder pillar
- feedforward
- feedthrough insulator
- feeler bulb
- feeler gauge
- felt insulation
- femtoampere
- Fermi interaction
- Fermi particle
- ferrimagnetic limiter
- ferrite attenuator