collector slit,接收器狹縫

collimation axis,視軸

collimation line,視准線

collision,衝突，碰撞

collisional activation,碰撞激活

collisional activation mass spectrometer,碰撞激活質譜計

colorimeter,比色計；色度計

colour filter,顏色濾光片

colour meter,水色計

column,鏡筒

column capacity,柱效能

column life,柱壽命

column-parity field,列奇偶校驗字段

column switching,柱切換

coma,彗差

combination digital logger,數字式綜合測井儀

combination electrode,复合電极

combination logging instrument,組合測井儀

combination water meter,复式水表

combined column,复合柱

combined load testing machine,得合試驗机

combined pressure and vacuum gauge,壓力真空表

combined test,綜合試驗

combined test cabinet,綜合試驗箱

command,命令

command accepted,命令接受

command message,命令報文

command operation,命令操作

command-reply transaction,命令﹛回答事務

commissioning test,運行試驗

common control signals,公共控制信號

common magnet galvanometer,共磁式振動子

common mode rejection,共模抑制

common mode rejection ratio(CMRR),共模抑制比

common mode signal,共模信號

common mode voltage,共模電壓

communication subnet,通信子网

communication system,通信系統

communications terminal,通信終端

commutation error,換碼誤差

commutation point,轉碼點

comparative read-out,比較讀出

comparator,比較器

comparator coil,比較線圈

compare,比較

comparing element,比較元件

comparison calibration,比較法校准

comparison method of calibrating thermocouple,熱電偶比較檢定法

comparison method of calibration,比較法標定

comparison(method of )measurement,比較測量法

comparison standard,比較標准器

comparison value,比較值

compass,羅盤（儀）

compass theodolite,羅盤經緯儀

compatibility,兼容性；相容性

compensated micromanometer,補償微壓計

compensated pyrgeliometer,補償直接日射強度表

compensated scale barometer,定槽水銀气壓表

compensating element,補償元件

compensating error of automatic vertical index,豎直度盤指標補償誤差

compensating extension lead,補償型延長導線

compensating gauge,補償計（片）

compensating setting error of leveling compensator,視軸安平補償誤差

compensation,補償

compensation density logger,補償密度測井儀

compensation neutron logger,補償溫度范圍

compensation type airborne electromagnetic instrument,補償式航電儀

compensator,補償器

compensator level,自動安平水准儀

compiler,編譯程序

compiler generator,編譯程序的生成程序

complementary gas,附加气

complementary(method of)measurement,互補測量（法）

complete controllability,完全可控性；完全能控性

cpmplete failure,完全失效

complete immersion thermometer,（完）全浸（沒）溫度計

complete observability,完全可觀測性；完全能觀測性

complete set up for chemical oxygen demand determinations in seawater, 海水化學耗氧量測定系統

complex radiation,复電阻率儀

complex system,复雜系統

complexation chromatography,絡合色譜法

component proton magnetometer,分量質子磁力儀

component superconducting magnetometer,超導分量磁力儀

composite control,組合控制

composite error,合成誤差

composite test,組合試驗

composite-temperature-compensation strain gauge,組合溫度補償應變計

composition deviation transmitter,成分（偏差）變送器

compound control,复全控制

compound control system,复合控制系統

compound oxide series gas sensor,复合氧化物系气敏元件

compound system,复合系統

compound-wound current transformer,混合繞組電流互感器

compressibility factor,壓縮系數

compression force,壓縮力

compression plate,壓板

compression testing machine,壓力試驗机

compressive strength,壓縮強度