phase plane portrait,相平面圖

phase ratio,相比率

phase reference generator,參考相位發生器

phase response,相位響應

phase sensitive detector,相敏檢波器

phase sequence indicator,相序指示器

phase space,相空間

phase trajectory,相軌跡

phase transition,相變

phase variable,相變量

phase-continuous FSK,相位連續FSK

phase-crossover frequency,相位交越頻率

phase-frequency characteristics,相頻特性

phase-shift ultrasonic flowmeter,相移式超聲流量計

phon,方（響度級的單位）

phosphorescence,磷光

photo conduction tube,光導管

photo electron spectroscopy (PES),光電子能譜法

photo-electrical coded compass,光電碼羅盤

photo-electrostatic display recorder,感光靜電顯示記錄儀

photo ionization,光電离

photo resistor,光敏電阻器

photo-sensitive recorder,感光顯示記錄儀

photo sensor,光敏元件

photo-theodoliti,攝影經緯儀

photoacoustic spectrometry,光聲光譜法

photoconductive transducer [sensor],光導式傳感器

photoelectric colorimeter,光電比色法

photoelectric comparator,光電比較儀

photoelectric effect,光電效應

photoelectric fluxmeter,光電磁通表

photoelectric length meter,光電式長度計

photoelectric position detector,光電式位置檢測器

photoelectric roll gap measuring instrument,光電式輥縫測量儀

photoelectric tachometer,光電式轉速表

photoelectric tachometric transducer,光電式轉速傳感器

photoelectric thermometer,光電溫度計

photoelectric transmissometer,光電透射儀

photoelectric width meter [gauge],光電式寬度計

photoelectro magnetic element,光電磁敏元件

photoionization detector (PID),光离子化檢測器

photometer,光度計

photometric linearity,光度測量線性

photomultiplier,光電倍增管

phototheodilite,攝影經緯儀；照相經緯儀

phototube,光電管

photovoltaic cell,光電池

photovoltaic transducer [sensor],光伏式傳感器

physical layer (PL),物理層

physical model,物理模型

physical modeling,物理建模

physical property type transducer [sensor],物性型傳感器

physical quantity transducer [sensor],物理量傳感器

physical similarity,物理相似

physical simulation,物理仿真

physical symbol system,物理符號系統

physiological quantity transducer [sensor],生理量傳感器

picture spectrograph,圖象攝譜儀

piezoelectric acceleration transducer,壓電式加速度傳感器

piezoelectric effect,壓電效應

piezoelectric force transducer,壓電式力傳感器

piezoelectric microphone,壓電傳聲器

piezoelectric pressure transducer,壓電式壓力傳感器

piezoelectric transducer [sensor],壓電式傳感器；壓電換能器

piezoelectric vibrator,壓電振動器

piezoelectric vibrometer,壓電式振動計

piezometer ring,均壓環

piezo-resistance effect,壓阻效應

piezoresistive acceleration transducer,壓阻式加速度傳感器

piezoresistive accelerometer,壓阻式加速度計

piezoresistive effect,壓阻效應

piezoresistive pressure transducer,壓阻式壓力傳感器

piezoresistive transducer [sensor],壓阻式傳感器

piezoresistive vibrometer,壓阻式振動計

piggy-back microbiological sampler,复背式微生物采集器

pilot,先導閥

pilot valve,指揮器

pilot balloon theodolite,測風經緯儀

pilot-operated regulator,指揮器操作型自力式調節閥

pilot-operated solenoid valve,先導型電磁閥

pin-cushion distortion,枕形畸變；正畸變

pinger,水聲信標

pinion,軸齒輪

pink noise,粉紅噪聲

pipe prover,標准体積管；管式校准器

pipe reducer,异徑接管

Pirani gauge,電阻規；皮拉尼規

Pirani vacuum gauge,皮拉尼真空計

piston,活塞

piston actuator,活塞執行机构

piston-cylinder assembly,活塞部件

piston gauge,活塞式壓力計

piston gauge with equilibrium liquid,帶平衡液柱活塞式壓力計

piston gauge with re-entrant cylinder column,反壓活塞式壓力計

piston prover,活塞校准器

piston rotation perdurability,活塞下降速度

piston with weight carrier,帶有底盤裝置的活塞

pistonphone,活塞發聲器