- multicolour sensor
- multicomponent
- multicontact switch
- multicylinder compressor
- multilevel froster
- multipass cooler
- multiphase mixture
- multiple integral
- multiple ionized
- multiple order
- multiple resonance
- multiple tariff
- multiplex
- multipurpose cryostat
- multislot magnertron
- muon yield
- n-power
- n-tuple
- nano-tube
- nascent
- natural cold
- natural draft
- natural insulant
- natural load
- natural mode
- natural aeration
- natural convection
- natural draught
- natural evaporation
- natural fractals
- natural freezing
- Natural law
- natural science
- natural width
- navigational compass
- near echo
- near-prompt
- nebular
- necking
- needle gap
- Neel point
- Neel temperature
- negative booster
- negative carrier
- negative conductor
- negative crystal
- negative electricity
- negative electrode
- negative terminal
- negentropy
- neon tube
- neptune
- Nernst glower
- net
- net effect
- net power
- network filter
- network function
- network impedance
- neuro-electricity
- neutralized state
- neutron absorption
- neutron balance
- Newtonian fluid
- Nichols locus
- nicols
- natural scale
- natural wavelength
- near equilibrium
- near field
- near-critical
- near-sonic
- nebula
- needle thermocouple
- negative absorption
- negative component
- negative lens
- negative plate
- negative pole
- negative temperature
- neon refrigeration
- Nernst bridge
- Nernst lamp
- network admittance
- network analysis
- network relay
- neural network
- neutral relay
- neutrality
- neutralize
- neutralizing circuit
- neutron activation
- neutron interferometer
- neutron moderator
- neutron reflectivity
- neutron star
- Newtonian physics
- NH3 compressor
- Nichols diagram
- nichrome