To change from a solid to a liquid, usually by heat.
Melt point
The temperature at which the solid asphalt becomes a liquid.
Melt-through
Defective welding operation, which allows the heat to melt through the base metal.
Member
A single piece of material used in a structure.
Membrane
A thin, soft, pliable sheet or layer of material.
Membrane base flashing
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
Measuring, especially as to length, area, and volume.
Mercury
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
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.
