- suction connection
- suction cycle
- suction fan
- suction gas
- suction stroke
- sulphurous
- summation meter
- summation symbol
- summer cycle
- summing network
- summit law
- sump
- sun effect
- sunbrightness test
- supaergrid
- superchiller
- superconductivity bolometer
- supercooled
- supercooler
- supercritical field
- supercritical fluid
- supercritical pressure
- supercritical speed
- supercriticality
- superfast freezing
- superficial expansivity
- superfluid 3He
- superheat change
- superheat rejection
- superheated steam
- superheavy
- supermalloy
- supernova
- supernovae explosion
- string electrometer
- string model
- string parameterization
- stringing
- strip
- strip line
- stripped
- stroboscopic instrument
- structural defect
- structure factor
- stuffing box
- subcooled helium
- subcooled refrigerant
- subcooler
- subcooling cycle
- subcooling rate
- subcritical mass
- subcritical state
- subfreezing temperature
- sublime
- sublunar point
- submillimeter wave
- subnuclear
- subscriber line
- subscription
- subsonic aerodynamics
- subsonic frequency
- substandard
- substitute
- subsurface wave
- subthermal
- subzero storage
- suction conditions
- suction side
- suction superheater
- summation network
- summer conditions
- summer ventilation
- structural transition
- structureless
- stub angle
- stub cable
- subcooled
- subcooling procedure
- subcritical temperature
- subfreezing air
- subharmonic
- sublimation cooling
- sublimed moisture
- submerged condenser
- submersed
- submersible motor
- subordinate series
- subscriber number
- subsolar point
- subsonic diffuser
- substage
- subsynchronous resonance
- subtransient
- subzero temperature
- suction cap
- stroboscopic photography
- strong solution
- stuffing bit
- styropor foam
- subassembly