Chapter P: P Pyrometer

P-?

P

Symbol for the element phosphorus.

P

Symbol for power.

p

Symbol for pressure.

?, ?

See also pi (?, ?).

?, ?

See also phi (?, , or ?);.

?, ?

See also psi (?, ?) or psi.

P

palladium

CAS number: 7440-05-3. An alloying metal that does not tarnish in air. The most reactive of the platinum group. Used for electrical relay contacts, Alloys with ruthenium makes "white" gold for use in jewelry, making special resistance alloys, aircraft spark plugs, high-temperature solders, protective coatings.

Symbol: Pd	Density (g/cc): 12.02
Physical state: Silvery solid	Melting point: 2,826 F/1,552 C
Periodic Table Group: VIII	Boiling point: about 7,200 F/3,980 C
Atomic number: 46	Source/ores: By-product of copper and zinc production
Atomic weight: 106.42	Crystal structure: Face-centered cubic.
Valence: 2,3,4	Mohs hardness: 4.8

palm oil

Yellow-brown, buttery solid at room temperature. Used as a cutting-tool lubricant; terne plating, in hot-dipping of tin coatings to prevent oxidation while it is cooling. Combustible.

parallel clamp

Also known as a toolmakers' clamp. A clamp consisting of two pointed jaws with a screw passing through the center of each jaw and another screw at the flat or opposite end of the jaws. Used to hold parts together or to hold small parts in the pointed end by tightening the screw at the flat end of the jaws which should be kept parallel to the workpiece surfaces.

parallel thread

See also...