Chapter W: W: Wafer WYSIWYG

wafer: 1. A thin disk of a solid substance. 2. A thin part or component, such as a filter element.
wafer body: A thin, annular-section butterfly body whose end surfaces are located and clamped between the piping flanges by bolts that extend from flange to flange. [ANSI/ISA-75.05.01 2000]
wafer-type temperature detector: A type of element for a resistance thermometer that is designed with fine insulated wire made of copper, nickel, or platinum. The wire is sandwiched between protective sheets of insulating material inside a sealed, wafer-type enclosure. These detectors combine small mass with good thermal contact to give fast response times.
WAIS: Wide Area Information Servers (pronounced "wayz"). Sophisticated search indexes that can find information based on subjects or descriptions rather than just keywords. They are helpful in accessing whole groups of documents related to the topic being researched.
waist: The center portion of a vessel, tank, or container that is smaller in cross section than adjacent sections.
wait condition: The condition of a task when it is dependent on an event or events occurring in order to enter the ready condition.
wait state: In data processing, the elapsed time between the request for data from memory and when the memory chip responds.
wall box: A structure in a wall of a steam generator through which apparatuses, such as soot blowers, extend into the setting.
WAN: Wide area network. A network that links data processing and telecommunications equipment over a larger geographic area than a single work site or a metropolitan...

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