porous-layer open-tubular column;PIOT column,多孔层空心柱

port,通信口；端口

port guiding,阀口导向

portable hardness tester,携带式硬度计

portable multipurpose instrument set,轻便综合观测仪

portable X-ray detection apparatus,携带式X射线探伤机

portability,可移植性

portable (measuring) instrument,可[便]携式（测量）仪表

position,位置

position encoder,位置编码器

position error,位置误差；四角误差

position error coefficient,位置误差系数

position feedback,位置反馈

position indicating switch,阀位指示开关

position limit switch,行程开关

position transducer [sensor],位置传感器

positioner,定位器

positive displacement flowmeter,容积式流量计

positive feedback,正反馈

positive knives linear,正刀联线

positive-negative action,正负作用

positive negative three-step action,正负三位作用

positive pressure,正压

positive shock response spectrum,正冲击响应谱

positive strain,正应变

positive system,正系统

positive temperature coefficient thermistor,正温度系数热敏电阻

post emulsifiable dye penetrant testing method,后乳化性着色渗透探伤法

post emulsifiable fluorescent penetrant testing method,后乳化性荧光渗透探伤法

post emulsifiable penetrant,后乳化性渗透液

potential evaporation,蒸发率

potentiometer,电位器

potentiometer compass,电位器罗盘

potentiometer pressure transducer,电位器式压力传感器

potentiometer type pressure transducer,电位器式压力传感器

potentiometric analyzer,电位式分析器

potentiometric displacement transducer,电位滴定（法）

potentiometric transducer [sensor],电位器式传感器

potentiometry,电位法

powder-filled enclosure (Ex q），充砂外壳(Ex q）

powder sample,粉末样品

power amplifier,功率放大器

power compensation differential scanning calormeter,功率补偿差示扫描量热仪

power-compensation differential scanning calorimetry,功率补偿型差示扫描量热法

power factor meter,功率因数表

power source,主电源

power spectral density,功率谱密度

power supply device,电源装置

power supply frequency,电源频率

power supply voltage,电源电压

power system automation,电力系统自动化

power-fail circuit,电源故障电路

practical response time,实用响应时间

practical salinity scale 1978,1978实用盐标

pre-conditioning time,预处理时间

pre-vacuum chamber,预抽室

pre-weighing,预称装置

preamplifier,前置放大器

precipitation gauge,雨量量筒

precipitation intensity,降水强度

precise stereoplotter,精密立体测图仪

precision,精密度

precision disc grinder,样品磨薄机

precision micrometer [microdisplacement] inspection instrument,精密测微检定仪

precision of measurement,测量精密度

precision (pressure) gauge,精密压力表

predictive control,预测控制

preliminary adjustment,初调；预调整

premix burner,预混燃烧器

preparative chromatography,制备色谱法

preparative gas chromatograph,制备气相色谱仪

preparative liquid chromatograph,制备液相色谱仪

prepayment meter,预付费电度表

press,压块机

pressure,压力；压强

pressure adjusting screw,压力调节螺杆

pressure altitude formula,气压测高公式

pressure bell,引压钟

pressure compensator,压力补偿器

pressure constant state,恒压状态

pressure/depth conversion factor,压力-深度转换系数

pressure facility,压力设备

pressure frequency response of microphone,传声器声压频率响应

pressure gauge,压力表

pressure gauge tester,压力表校验器

(pressure)gauge with back connection,轴向压力表

(pressure)gauge with bottom connection,径向压力表

(pressure)gauge with electric contact,电接点压力表

(pressure)gauge with transmission device,电远传压力表

pressure gradient correction factor,压力梯度校正因子

pressure gradient microphone,压差传声器

pressure in the ocean,海洋中的压力

pressure instrument,压力仪表

pressure isolating chamber,压力隔离容器

pressure level measuring device,压力液位测量装置

pressure loss,压力损失

pressure measuring set,压力测量仪

pressure microphone,压强传声器