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Summary: Building dictionary to explain building jargon and terminology from A - Z.
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Building dictionary for the letter P - Page 8
Perspective drawing
A three-dimensional graphic presentment of a project (or part of a project).
Pervious soil
A soil that allows relatively free passage of water.
Petroleum asphalt
Asphalt refined directly from petroleum, as opposed to asphalt from natural deposits.
Petroleum hydrocarbon
Any of a number of solvents refined from cured petroleum and used to lower the viscosity of oils and resins.
Petroleum oil
A refined spray oil made from a flammable hydrocarbon-based mixture found beneath the earth's surface. Petroleum oils are categorized as unsaturates, aromatics, naphthenes, and paraffins.
Petroleum spirit
A thinner, for paints and varnishes, having a low-aromatic hydrocarbon content, obtained in petroleum distillation.
Pew
A bench-like seat used in a church.
PH
A measure of the relative acidity or alkalinity of a liquid.
Phantom line
A broken line, usually fine, with alternating long and short dashes, in order to show details.
Phase converter
An electrical device that converts single-phase power to the smooth, continuous and universally adaptable three-phase power.
Phenol
A product of the petroleum industry used in the production of phenolic resin, epoxy resins, plasters, and exterior plywood glue. Phenol is made from benzene. It exists naturally in coal tar and wood tar. However, phenol from these sources is rarely used in the production of glue.
Phenolic compounds
Substances containing phenols.
Phenolic resin
A class of synthetic, oil-soluble resins (plastics) produced as condensation products of phenol, substituted phenols and formaldehyde, or some similar aldehyde that may be used in paints for concrete.
Philippine mahogany
The wood of several types of trees found in the Philippines. The wood resembles mahogany in grain. Density varies from very light to quite heavy. The heavier, darker woods are durable and strong and used like mahogany. The lighter weight, colored woods are used for interior plywood.
Phillips head screw
A screw with a recessed head and an X-shaped driving indentation.
Photoelectric control
An electric control that responds to a change in incident light.
Photoelectric cell
An electronic device for measuring illumination level or detecting interruption of a light beam. The electric output or resistance of the device varies according to the illumination.
Photogrammetry
The practice of calculating measurements and drawing up surveys through the use of photographs, especially aerial photographs.
Piano hinge
See continuous hinge.
Pick
A hand tool, consisting of a steel head pointed at one or both ends and mounted on a wooden handle, for loosening and breaking up compacted soil or rock.
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