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  2. Micrometer (device) - Wikipedia

    en.wikipedia.org/wiki/Micrometer_(device)

    A micrometer, sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw widely used for accurate measurement of components [1] in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers.

  3. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    The most common ion gauge is the hot-cathode Bayard–Alpert gauge, with a small ion collector inside the grid. A glass envelope with an opening to the vacuum can surround the electrodes, but usually the nude gauge is inserted in the vacuum chamber directly, the pins being fed through a ceramic plate in the wall of the chamber. Hot-cathode ...

  4. Copper tubing - Wikipedia

    en.wikipedia.org/wiki/Copper_tubing

    While pipe sizes in Australia are inch-based, they are classified by outside rather than inside diameter (e.g., a nominal 3 ⁄ 4 inch copper pipe in Australia has measured diameters of 0.750 inches outside and 0.638 inches inside, whereas a nominal 3 ⁄ 4 inch copper pipe in the U.S. and Canada has measured diameters of 0.875 inch outside and ...

  5. Ultra-high vacuum - Wikipedia

    en.wikipedia.org/wiki/Ultra-high_vacuum

    These gauges must be calibrated. [3] The gauges capable of measuring the lowest pressures are magnetic gauges based upon the pressure dependence of the current in a spontaneous gas discharge in intersecting electric and magnetic fields. [4] UHV pressures are measured with an ion gauge, either of the hot filament or inverted magnetron type.

  6. Inch of water - Wikipedia

    en.wikipedia.org/wiki/Inch_of_water

    It is also given as inches of water gauge (iwg or in.w.g.), inches water column (inch wc, in. WC, " wc, etc. or just wc or WC), inAq, Aq, or inH 2 O. The units are conventionally used for measurement of certain pressure differentials such as small pressure differences across an orifice, or in a pipeline or shaft, [ 1 ] or before and after a ...

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