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  2. Electrical contact - Wikipedia

    en.wikipedia.org/wiki/Electrical_contact

    For contact spots of radii smaller than the mean free path of electrons , ballistic conduction of electrons occurs, resulting in a phenomenon known also as Sharvin resistance. [10] Contact force or pressure increases the size of the a-spot which decreases the constriction resistance and the electrical contact resistance. [ 11 ]

  3. Contactor - Wikipedia

    en.wikipedia.org/wiki/Contactor

    AC contactor for pump application. A contactor is an electrically controlled switch used for switching an electrical power circuit. [1] A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch.

  4. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    A list, usually tabular and often on the drawing (if not accompanying the drawing on a separate sheet), listing the parts needed in an assembly, including subparts, standard parts, and hardware. There is no consistently enforced distinction between an L/M, a BoM, or a P/L. PLM: product lifecycle management; plant lifecycle management: See also ...

  5. Gas–liquid contactor - Wikipedia

    en.wikipedia.org/wiki/Gas–liquid_contactor

    A gas–liquid contactor is a particular chemical equipment used to realize the mass and heat transfer between a gas phase and a liquid phase. Gas–liquid contactors can be used in separation processes (e.g. distillation, absorption) or as gas–liquid reactors or to achieve both purposes within the same device (e.g. reactive distillation).

  6. Centrifugal extractor - Wikipedia

    en.wikipedia.org/wiki/Centrifugal_extractor

    Multistage centrifugal extractor cross section drawing The feed solution initially containing one or more solutes (heavy phase on the cross section drawing Fig 3.), and an immiscible solvent having a different density (light phase on cross section sketches) flow counter-currently through the extractor’s rotor, designed with a stack of ...

  7. Contact resistance - Wikipedia

    en.wikipedia.org/wiki/Contact_resistance

    If a contact patch is sufficiently small, with dimensions comparable or smaller than the mean free path of electrons resistance at the patch can be described by the Sharvin mechanism, whereby electron transport can be described by ballistic conduction. Generally, over time, contact patches expand and the contact resistance at an interface ...

  8. Wikipedia : Manual of Style/Chemistry/Structure drawing

    en.wikipedia.org/.../Chemistry/Structure_drawing

    Chemical structures and reaction schemes should conform to the following: Images should be drawn with a molecule editor, never freehand; ACS settings should be used for both structures and reaction schemes. These settings are normally available as templates in chemical drawing programs. Use sans-serif fonts like Arial.

  9. Trace heating - Wikipedia

    en.wikipedia.org/wiki/Trace_heating

    The contactor or controller may include a thermostat if accurate temperature maintenance is required, or may just shut off a freeze-protection system in mild weather. Electrical heat tracing systems may be required to have earth leakage (ground fault or RCD ) devices for personnel and equipment protection.