- rectangular diffuser
- rectified
- rectified current
- rectified value
- rectifier
- rectifying
- rectifying column
- redox reaction
- reduce
- rectifying action
- rectifying resistance
- red-shift
- redistribute
- reduced property
- reduced scale
- reduced state
- reduced viscosity
- reducible representation
- reduction formula
- reed contact
- reefer
- reefer truck
- reemission
- reemitted radiation
- reentry
- reevaporation
- reference
- reference angle
- reference diode
- reference electrode
- reference level
- reference potential
- reference signal
- reference standard
- reference temperature
- referential
- refining
- reflecting grating
- reflection echelon
- reflection lobes
- reflector
- reflectoscope
- reflex angle
- reflux liquid
- refracted
- refraction loss
- refrangible
- refreezing
- refrigerant absorption
- refrigerant addition
- refrigerant bath
- refrigerant behaviour
- refrigerant calculation
- refrigerant chamber
- refrigerant charge
- refrigerant charging
- refrigerant circuit
- refrigerant component
- refrigerant condensate
- refrigerant consumption
- refrigerant contaminant
- refrigerant cycle
- refrigerant decomposition
- refrigerant density
- refrigerant discharge
- refrigerant distribution
- refrigerant droplet
- refrigerant entrainment
- refrigerant escape
- refrigerant evaporator
- refrigerant expansion
- refrigerant flow
- refrigerant head
- refrigerant ingress
- refrigerant lack
- refrigerant leak
- refrigerant leakage
- refrigerant mass
- refrigerant migration
- refrigerant motion
- refrigerant overcharge
- refrigerant particle
- refrigerant path
- refrigerant pool
- refrigerant quantity
- refrigerant requirements
- refrigerant side
- refrigerant source
- refrigerant starving
- refrigerant suction
- refrigerant thermostat
- refrigerant tray
- refrigerant valve
- refrigerant velocity
- refrigerant weight
- refrigerant zone
- refrigerant-22 unit
- refrigerated barge
- refrigerated canopy
- refrigerated carrier