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- Wafer
- A slice of semiconductor material upon which monolithic ICs are produced.
- Wafer Switch
- A rotary switch in which the contacts are arranged on levels.
- Wainscoting
- A wall facing, usually of wood, cut stone, or ceramic tile, that is carried only part way up a wall.
- Wall
- Solid structure that defines and sometimes protects an area.
- Wall Cloud
- An abrupt lowering of a cloud from its parent cloud base, a cumulonimbus or supercell, with no visible precipitation underneath.
- Wall Plug
- A piece of plastic, wood or fibre that is inserted into a drilled hole in masonry to allow a woodscrew to be fitted.
- Wallis, Barnes
- British engineer and inventor famous for the R100, Wellington bomber and the bouncing bombs.
- Walnut
- Cross grained wood used for ornamental work.
- WAN
- Abbreviation of Wide Area Network.
- Wankel Engine
- A rotary engine with a rotor rotating in an oval cylinder. Named after it′s designer Felix Wankel.
- Wankel, Felix Heinrich
- Inventor and developer of the wankel engine, a rotary engine.
- Warburg, Otto H
- German biochemist who was awarded a Nobel Prize in 1931 for his contributions to cellular metabolism.
- Warm Working
- Plastically deforming metal above room temperature but below the temperature at which the material undergoes recrystallization.
- Warmth
- A term that is used to describe a listening term in terms of frequency, generally considered the range from approximately 150Hz-400Hz.
- Warning Limits
- Limits placed on a control chart for variables or attributes at 1 and 2 sigma to help determine how far points lie from the centerline.
- Warp
- The yarns running lengthwise and parallel to the selvage in a woven fabric.
- Warren Truss
- Structural framework for supporting loads over long spans.
- Washer
- Used to distribute load under a nut or bolt locking surface.
- Washing Soda
- Alternative name for Sodium Carbonate.
- Washout Plug
- A small mudhole used for washing out the boiler.
- Waste Gate
- A valve used to limit the boost developed in a turbocharger.
- Waste Water
- The used water and solids from industrial processes that flow to a treatment plant.
- watch
- A traditional unit of time equal to 4 hours.
- Water
- A colourless, tasteless liquid with some very peculiar properties that stem from the bent H-O-H structure of its molecules.
- Water Absorption
- A materials tendency or lack of to absorb water.
- Water Cycle
- Also known as the Hydrologic Cycle.
- Water Electrolysis
- Process for the electrochemical decomposition of water in a divided electrolytic cell by electrolysis.
- Water Gas
- A fuel gas used in industrial synthesis of organic chemicals, and in welding, glassmaking, and other high-temperature industrial applications.
- Water Glass
- Old name for Sodium Silicate.
- Water Glycol Fluid
- A fluid whose major constituents are water and one or more glycols.
- Water Hammer
- Banging of pipes caused by the shock of closing valves - eg taps.
- Water Hardening
- High carbon grades of tool steel, straight carbon steels and low alloy steels that are hardened by quenching in water during the heat treating operation.
- Water Hardness
- Water contaminated with compounds of calcium and magnesium.
- Water Jet
- High-pressure stream of water used for cutting.
- Water Lubricant
- Water used as a lubricant.
- Water of Crystallization
- Water present in the crystal of a hydrate.
- Water of Rabel
- A solution of ethyl ether in ethanol.
- Water Softener
- A device or system used to remove calcium and magnesium hardness minerals from a water supply.
- Water Tube
- A boiler tube through which the fluid under pressure flows.
- Water Tube Boiler
- A boiler whose primary heating surface is composed of many small tubes, filled with water.
- Water Wall
- A furnace or other wall within a boiler enclosure that is composed of numerous closely set water tubes.
- Waterfall Plot
- A series of spectral maps taken at regular intervals of time or at regularly spaced shaft speeds, similar to the flow of a waterfall.
- Waterline
- The line of the water′s edge when the ship is afloat.
- Waterwheel
- A wheel with paddles designed to extract power from flowing water.
- Watt
- The watt is the SI unit of power and is equal to 1 joule per second.
- Watt Hour
- A unit of energy equivalent to one watt of power expended for one hour of time.
- Watt Hour Meter
- A meter used to measure electrical energy.
- Watt Hours per Kilogram
- Unit of energy density.
- Watt, James
- He made fundamental improvements in the steam engine, resulting in the modern, high-pressure steam engine, patented in 1769.
- Wattage Rating
- A rating expressing the maximum power that a device can safely handle.
- Watt-hour Efficiency
- This the energy out of a battery during discharge divided by the energy in during charging.
- Wattmeter
- A meter used to measure electrical power.
- Watts Link
- Lateral locating device for a solid axle.
- Wave
- The movement of energy from one place to another without any accompanying matter.
- Wave Antenna
- Same as a Beverage Antenna.
- Wave Equation
- The wave equation describes the propagation of waves.
- Wave Motion
- A recurring disturbance advancing through space with or without the use of a physical
medium.
- Wave Particle Duality
- The observation that electrons; photons; and other very small entities behave like particles in some experiments and like waves in others.
- Wave Phenomena
- The characteristics of radiant energy.
- Wave Train
- A continuous series of waves with the same amplitude and wavelength.
- Wave Winding
- An armature winding in which the two ends of each coil are connected to commutator
segments separated by the distance between poles.
- Waveband
- A series of wavelengths forming a group.
- Waveform
- The shape of a time domain signal as seen on an oscilloscope screen.
- Waveform Analysis
- Observation displays of voltage and current variations with respect to time or
by harmonic analysis of complex signals.
- Wavefront
- A set of points at which the phase of vibration of the physical quantity associated with a wave is the same.
- Wavefront Deformation
- Departure of a wavefront from ideal (usually spherical or planar) caused by surface errors or design limitations.
- Wavefunction
- A mathematical function that gives the amplitude of a wave as a function of position.
- Waveguide
- A rectangular, circular, or elliptical metal pipe designed to transport electromagnetic
waves through its interior.
- Waveguide Mode of Operation
- Any particular field configuration in a waveguide that satisfies the boundary conditions.
- Waveguide Post
- A rod of conductive material used as impedance changing devices in waveguides.
- Waveguide Screw
- A screw that projects into a waveguide for the purpose of changing the impedance.
- Wavelength
- The shortest repetition length for a periodic wave.
- Wavelength Dispersion
- Dispersion cause by the dependence of the phase and group velocities on wavelength due to geometric properties of the waveguide.
- Wavelet
- The wavelet allows a rapidly changing time history (e.g. door slam noise) to be
investigated in the frequency domain.
- Wavemeter
- An instrument for measuring the wavelength of an RF wave.
- Wave-Meter
- An instrument for measuring the frequency of a radio wave.
- Wavenumber
- Wavenumber describes the spatial variation of waves, phase change per unit distance.
- Wax
- Esters of monohydric alcohols.
- Way
- Longitudinal surface that guides the reciprocal movement of a machine part.