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| EFFICACY
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The amount of energy service or useful energy delivered per unit of energy input. Often used in reference to lighting systems, where the visible light output of a luminary is relative to power input; expressed in lumens per Watt; the higher the efficacy value, the higher the energy efficiency. |
| EFFICIENCY
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Under the First Law of Thermodynamics, efficiency is the ratio of work or energy output to work or energy input, and cannot exceed 100 percent. Efficiency under the Second Law of Thermodynamics is determined by the ratio of the theoretical minimum energy that is required to accomplish a task relative to the energy actually consumed to accomplish the task. Generally, the measured efficiency of a device, as defined by the First Law, will be higher than that defined by the Second Law. |
| EFFLORESCENCE
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The residue deposited on the surface of a material by crystallization of soluble salts. Sometimes appears on the surface of grout joints or unglazed tiles as a whitish powder or crust, caused by moisture reacting with impurities. |
| EFFLUENT
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Treated sewage from a septic tank or sewage treatment plant. |
| EFFORESCENCE
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White, powdery substance, which appears on masonry or concrete due to the migration, to the surface, of soluble, salts in the material. To remove, it must be brushed and cleaned off with a solution of muriatic acid diluted with water. |
| EGG AND DART MOLDING
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Tooled finish of alternating egg and dart shapes on molding. |
| EGGSHELL
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Low gloss sheen paint, which has a luster similar to an eggshell. Sometimes spelled eg-shel or egshell. |
| EGRESS
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Access from a land parcel to a public road or other means of exit. Right to exit and enter through land owned by another. |
| EJECTMENT
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Steps taken to remove someone, who does not have a contractual basis to be there, from the real property. |
| EJECTOR
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A mechanical device for pumping sewage from below the sewer line. |
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