- palletization
- pancake
- pantograph
- packet switching
- pair production
- paired cable
- PAL system
- paladium
- pan humidifier
- pancake coil
- panel cooler
- panel cooling
- panel evaporator
- paraballoon
- parabolic orbit
- parabolic reflector
- paraboloidal reflector
- paradeuterium
- paraelectric cooling
- paraffined paper
- paraffinic hydrocarbon
- parallactic displacement
- parallax error
- parallel
- parallel resonance
- parallel-plane
- parallelism
- parallelogram unit
- paramagnet
- paramagnetic cooling
- paramagnetic crystal
- paramagnetic material
- paramagnetic relaxation
- paramagnetic resonance
- paramagnetic substance
- paramagnetic susceptibility
- paramagnetism
- parametric amplification
- parametric amplifier
- parametric arrays
- parametric generation
- paraphase amplifier
- pantry display
- paper capacitor
- parabolic velocity
- paraboloidal antenna
- paraffinic precipitation
- parafovea
- parahelium
- parahydrogen
- parallactic ellipse
- parallax correction
- parallel capacitor
- parallel flow
- parallel impedance
- parallel wires
- paralleled compressors
- paralleling
- parasite
- parasitic
- parasitic resistance
- parasitic suppressor
- parastate
- paraxial
- paraxial optics
- paraxial pencil
- paraxial ray
- paraxial region
- paraxial trajectory
- parhelion
- parity
- parity rule
- parity transformation
- Parker bound
- parser
- partial
- partial absorption
- partial coherence
- partial condensation
- partial condenser
- partial cooling
- partial dehydration
- partial discharge
- partial dispersion
- partial drying
- partial eclipse
- partial error
- partial freezing
- partial liquefaction
- partial miscibility
- partial polarization
- partial thawing
- partially thawed
- partibility
- particle acceleration
- particle decay
- particle detection
- particle detector
- particle dynamics
- particle path