pyrheliometer,直接日射強度表；日射表

pyroelectric optical transducer [sensor],熱釋電式光傳感器

pyroelectric temperature transducer [sensor],熱釋電式溫度傳感器

pyrolysis apparatus,裂解器

pyrolysis gas chromatography,裂解气相色譜法

pyrometer lamp,高溫計燈泡

pyrradiometer,全輻射表

Q factor,Q值因數

Q-percentile life,可靠壽命

quad array,方陣

quadrant-edge orifice plate,1/4圓周邊緣孔板

quadrant electrometer,象限靜電計

quadrupole field,四极場

quadrupole ion trap,四极离子阱

quadrupole mass filter,四极濾質器

quadrupole mass spectrometer,四极質譜計

quadrupole probe,四极探頭

quadrupole residual gas analyzer,四极殘余气体分析器

quadrupole rods,四极杆

qualification,鑒定

qualification standard,鑒定標准

qualification test,鑒定試驗

qualitative analysis,定性分析

quantitative differential thermal analysis (QDTA),定量差示熱分析

qualitative physical model,定性物理模型

quality,質量

quality assurance,質量保証

quality control (QC),質量控制

quality inspection,質量檢驗

quality management,質量管理

quality supervision,質量監督

quantitative analysis,定量分析

quantitative differential thermal analysis,定量差熱分析

quantitative differential thermal analyzer,定量差熱（分析）儀

quantity of heat,熱量

quantity of illumination,光照量

quantity of radiant energy,輻射能量

quantity of radiation,幅射能量

quantity to be measured,被測量

quantization,量化

quantization error,量化誤差

quantized error,量化誤差

quantized noise,量化噪聲

quantized signal,量化信號

quartet,四重布置；四重檢測

quarter circle orifice plate,1/4圓孔板

quartz-Bourdon tube (pressure)gauge,石英彈簧管壓力計

quartz crystal unit humidity transducer[sensor]晶体振子式濕度傳感器

quartz module,石英組件

quartz spring gravimeter,石英彈簧重力儀

quartz thermometer,石英溫度計；石英溫度表

quasi-equilibrium theory,准平衡理論

quasi-molecular ion,准分子离子

quasi-periodic vibration,准周期振動

quasi-rigid rotor,准剛性轉子

quasi-sinusoidal quantity,准正弦量

quasi-static unbalance,准靜不平衡

quasilinear chareacteristics,准線性特性

quenching,阻塞

question and answer mode,問答式

queuing theory,排隊論

quick thermophysical property measuring apparatus,熱物性快速測定儀

quintet,五重布置；五重檢測

quotient-meter,商值表

rack,框架

radar altimeter,雷達高度計

radial clearance,徑向間隙

radial distortion,徑向畸變

radial electrostatic field analyzer,徑向靜電場分析器

radial heat shield,隔熱屏

radiance,幅射亮度；輻射率

radiance temperature,亮度溫度

radiance thermometry,亮度測溫法

radiant element,輻射元件

radiant energy,輻射能（量）

radiant flux,輻射通量

radiant intensity,輻射強度

radiant power,輻射功率

radiation,輻射

radiation balance meter,輻射平衡表

radiation detecting device,輻射檢測器

radiation dose transducer [sensor],射線齊量傳感器

radiation energy,輻射能量

radiation exitance,輻（射）出（射）度

radiation fin bonnet,散熱片型上閥蓋

radiation flux,輻射通量

radiation heatflowmeter,輻射熱流計

radiation intensity,輻射強度

radiation monitor,輻射監測儀

radiation pyrometer,輻射高溫計

radiation sensor,射線敏感元件

radiation temperature,輻射溫度

radiation temperature transducer [sensor],輻射溫度傳感器

radiation test,輻射試驗

radiation thermometer,輻射溫度計

radiation thermometry,輻射測溫法

radiation transducer [sensor],射線傳感器

radio chromatography,放射色譜法