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| Melt-through
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Defective welding operation, which allows the heat to melt through the base metal. |
| Member
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A single piece of material used in a structure. |
| Membrane
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A thin, soft, pliable sheet or layer of material. |
| Membrane base flashing
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Plies of roof membrane material used to seal a roof at the vertical plane intersections, such as at a roof-wall and roof-curb junctures. |
| Mensuration
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Measuring, especially as to length, area, and volume. |
| Mercury
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A heavy, silver-white metallic, chemical element, liquid at ordinary temperatures, above -38.9 degrees F. It is often used in measuring devices, such as thermometers. Atomic Symbol Hg. Atomic Number 80. Atomic Weight 200.59. |
| Mercury lamp
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A high-intensity discharge light source operating at a relatively high pressure (about 1 atmosphere) and temperature in which most of the light is produced by radiation from excited mercury vapor. Phosphor coatings on some lamp types add additional light and improve color rendering. |
| Mercury switch
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Electrical switch with mercury and electrical contact enclosed in a bulb, which when the bulb is in a certain position, the mercury spans the contact to complete the circuit which allows electrical current to flow. |
| Mercury vapor lamp
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A high-intensity discharge lamp that uses mercury as the primary light-producing element. Includes clear, phosphor coated, and self-ballasted lamps. |
| Merge
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(1) To join together. To unite. To combine. (2) To lose identity by being absorbed. |
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