hydraulic natural frequency,液壓固有頻率

hydraulic power supply,液壓動力源

hydraulic step motor,液壓步進馬達

hydraulic testing machine,液壓式試驗机

hydraulic vibrator,液壓振動器

hydrodynamic noise,液体動力噪聲

hydrofoil shape vehicle,水翼型拖曳体

hydrogen electrode,氫電极

hydrogen(pressure)gauge,氫壓力表

hydrogen regulator,氫气減壓器

hydrographic winch,水文絞車

hydrophone calibrator,水听器校准器

hydrophone streamer,海洋地城電纜；拖纜；漂浮電纜

hydrophone,水听器

hydrostatic level,液体靜力水准儀

hydrostatic vater tand,靜水槽

hygrograph,濕度計

hygrometer calibration chamber,濕度表檢定箱

hygrometer,濕度表

hygrometeric tables,濕度查算表

hygrothermograph,溫濕計

hypercycle theory,超循環理論

hyperstability,超穩定性

hypsometer,沸點測高表

hystersis,回差

hysteresis error,滯環誤差；滯后誤差

hysteresis error plus dead band,回差

hysteresis loop,滯環

I/O channel,輸入輸出出通道；I/O通道

ice point,冰點 ideal gas temperature scale,理想气体溫標

ideal inherent equal percentage flow characteristic,理想固有等百分比注量特性

identifiability,可辨識性；能辨識性

ignition wire,點火線

illuminance transducer[sensor],照度傳感器

illuminating aperture angle,照明孔徑角

illuminating brightness,照明亮度

illuminating system,照明系統

illumination,照度

image electro-magnetic shift,象電位移

image plane,象面

image point,象點

image recognition,圖象識別

image rotation,象旋轉

image transdcer[sensor],圖象傳感器

imaging system,成象系統

immersion depth,浸入深度

immersion error,浸入誤差

immersion line(of liquid-in-glass thermometer),（玻璃溫度計的）浸沒線

immersion testing,液浸法

immersion type probe,水浸探頭

impact energy,衝擊能量

impact hammer,衝擊錘体

impact pendulnm,衝擊擺錘

impact specimen support,衝擊試校支架

impact test,衝擊試驗

impact testing machine,衝擊試驗机

impact toughness,衝擊韌性

impact velocity of the pendulum,擺錘的衝擊速度

impedance analysis,阻抗分析

impedance blood volume transducer[sensor],阻抗式血容量傳感器

impedance head,阻抗頭

imedance plane diagram,阻抗平面圖

impedance respiratory frequency transducer[sensor],阻抗式呼吸頻率傳感器

impeller,旋漿

impregnated base strain gauge,浸膠基應變計

impulse distance meter,脈衝式測距儀

impulse function,衝激函數；脈衝函數

impulse precision sound level meter,脈衝精密聲級計

impulse response,衝激響應；脈衝響應

impulsive sound,脈衝聲

in-situ colour meter,現場水色計

in-situ extraction sampler,現場萃取采水器

im-situ salinometer,現場鹽度計

in-situ seawater oxygenomter,海水溶解氧現場測定儀

inaccuracy,不精确度

inboard rotor,內重心轉子

incline impact test,斜而衝擊試驗

ynclined-tube manometer,傾斜壓力計

inclinometer,井斜儀

increase of area,斷面增大率

increased safety electrical apparatus(Ex e),增安型電气設備（Ex e)

incremental control,增量控制

incremental motion control system,增量運動控制系統

incremental range,微調（增量）范圍

incremental testing,增量測試

independent conforminty,獨立一致性

independent linearity,獨立線性度

index,指示器；指數；索引

index level,豎直度盤指標水准器

index(of an indicating device),（指示机构的）指示器

index of asymmetry,非對稱性指數

index register,變址寄存器

indicated electrode,指示電极

indeicated strain,指示應變

indicated value,指示值

indicating device,指示裝置；指示机构

indicating instrument,指示儀器儀表

indicating(measuring)instrument,（測量儀器儀表）的示值