| Eductor Tube An educator tube or dip tube permits the withdrawal of liquified compressed gases in the liquid phase with the cylinder in the normal upright position, without having to invert the cylinder. |
| Efficiency Isothermal: Is the ratio of the theoretical work calculated on an isothermal basis to the actual work transferred to the gas during compression. |
| Efficiency Volumetric: Is the ratio of actual capacity to piston displacement, stated as a percentage. |
| Elastic Deformation: Nonpermanent deformation, totally recovered upon release of an applied stress.
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| Elastomer: A polymeric material that may experience large and reversible elastic deformations.
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| Electrodeposition: (1) the deposition of a conductive material from a plating solution by the application of electrical current; (2) the deposition of a substance on an electrode by passing electric current through an electrolyte; electroplating, electroforming, electrorefining, and electrotwinning result from electrodeposition.
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| Electrolyte: A solution through which an electric current may be carried by the motion of ions.
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| Electromagnetic Compatibility (EMC) : Electromagnetic compatibility is the ability of telecommunications equipment to perform its individually designed function in a common electromagnetic environment without causing or suffering unacceptable degradation due to unintentional electromagnetic or radio frequency interference (EMI/RFI) |
| Electromagnetic Force: One of fundamental forces due to electric charges, both static and moving.
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| Electromagnetic Radiation: Energy propagated at the speed of light by an electromagnetic field.
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| Electrometer : A highly refined DC multimeter. In comparison with a digital multimeter, an electrometer is characterized by higher input resistance and greater sensitivity. It can also have functions not generally available on DMMs (e.g., measuring electrical charge) |
| Electron Acceptor: A chemical entity that accepts electrons transferred to it from another compound. It is an oxidizing agent that, by virtue of its accepting electrons, is itself reduced in the process. See also terminal electron acceptor and oxidation-reduction.
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| Electron Donor: A chemical entity that donates electrons to another compound. It is a reducing agent that, by virtue of its donating electrons, is itself oxidized in the process. |
| Electron: An elementary particle carrying 1 unit of negative electric charge. Its mass is 1/1837 that of a proton. |
| Email -- (Electronic Mail): Messages, usually text, sent from one person to another via computer. E-mail can also be sent automatically to a large number of addresses. |
| Emissivity: At a given wavelength the ratio of infrared energy radiated by an object at a given temperature to that emitted by a blackbody at the same temperature The emissivity of a blackbody is unity at all wavelengths. |
| Empirical Law: A law strictly based on experiment, which may lack theoretical foundation.
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| Emulsifier: Additive that promotes the formation of a stable mixture, or emulsion, of oil and water. Common emulsifiers are: metallic soaps, certain animal and vegetable oils, and various polar compounds |
| Endothermic Characterized by or formed with absorption of heat |
| Enthalpy: Is the sum of the internal and external energies. |
| Entropy: Is a measure of the unavailability of energy in a substance. |
| Environmental Rating: A rating given (usually by agencies and regulatory bodies) to indicate the severity of the environment in which the unit will function reliably. |
| Enzyme: Any of numerous proteins or conjugated proteins produced by living organisms and functioning as biochemical catalysts. A protein that a living organism uses in the process of degrading a specific compound. The protein serves as a catalyst in the compounds biochemical transformation.
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| Epitaxy: Induced orientation of the lattice of a crystal of a surface deposit by the lattice of the substrate crystal.
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| Equilibrium: (Translational) Condition in which the net force on an object is zero. (Rotational) Condition in which the net torque on an object is zero.
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| Ethernet: Xerox standard networking protocol used in local area networks, often connecting dissimilar devices.
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| Eutectic: Upon cooling, a liquid phase transforms isothermally and reversibly into two intimately mixed solid phases; the lowest melting composition in a material system.
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| Ex Situ: Moved from its original place; excavated; removed or recovered from the subsurface.
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| Exothermic: A term used to describe a chemical process in which heat is released. For example, combustion is an exothermic process because heat is released. |
| Explosion: An explosion is an uncontrolled chemical reaction which generates a large amount of heat and gas in a short period of time. |
| Extranet: An intranet that is accesible to computers that are not physically part of a companys? own private network, but that is not accessible to the general public, for example to allow vendors and business partners to access a company web site. Often an intranet will make use of a Virtual Private Network. (VPN.) |
| Extrusion: A forming technique whereby a material is forced, by compression, through a die orifice.
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