Model Engineering Glossary

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p (pico)

The prefix p or pico indicates the unit should be multiplied by 10^-12.

See also: Decimal Prefixes.

Parallelogram

See also: Conversion of Units.

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Parisian Metal

69 % Copper 19.5 % Nickel 6.5 % Zinc 5 % Cadmium

Partinium

7.4 % Copper 1.7 % Zinc 88.5 % Aluminium 1.1 % Silicon 1.3 % Iron

Permalloy

78.5 % Nickel 21.5 % Iron

Perminvar

45 % Nickel 30 % Iron 25 % Cobalt

Pewter

Traditionally an alloy containing 80% tin and 20% lead.

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Phenol

Trade name: Carbolic acid

Chemical formula: C₆H₅OH

See also: Chemical Table.

Physical Constants

Avogadro's number, Bohr magneton, ....... , Volume of 1 mol of ideal gas. more......

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Pine

Easily worked and used where moderate strength and durability are required. Turpentine is obtained from the pine.

See also: Timber.

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Plane

A North American wood that resembles beech, durable in water but not in air.

See also: Timber.

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Platinoid

60 % Copper 14 % Nickel 24 % Zinc 2 % Tungsten

Plumbate

Trade name: Red lead

Chemical formula: 2PbO PbO₂

See also: Chemical Table.

Poplar

A light wood, but not very strong and or very good wear resistance.

See also: Timber.

Potash

Chemical name: Potassium carbonate

Chemical formula: K₂CO₃

See also: Chemical Table.

Potassium Bromide

Chemical formula: KBr

See also: Chemical Table.

Potassium Carbonate

Trade name: Potash

Chemical formula: K₂CO₃

See also: Chemical Table.

Potassium Chlorate

Chemical formula: KClO₃

See also: Chemical Table.

Potassium Chloride

Chemical formula: KCl

See also: Chemical Table.

Potassium Chromate

Chemical formula: K₂CrO₄

See also: Chemical Table.

Potassium Cyanide

Chemical formula: KCN

See also: Chemical Table.

Potassium Dichromate

Chemical formula: K₂Cr₂O₇

See also: Chemical Table.

Potassium Iodide

Chemical formula: KI

See also: Chemical Table.

Potassium Hydroxide

Trade name: Caustic potash

Chemical formula: KOH

See also: Chemical Table.

Pot Metal

88 % Copper 12 % Lead

Propane

Chemical formula: C₃H₈

See also: Chemical Table.

Prussic Acid

Chemical name: Hydrogen cyanide

Chemical formula: HCN

See also: Chemical Table.

Pyrolusite

Chemical name: Manganese dioxide

Chemical formula: MnO₂

See also: Chemical Table.

Pythagoras's Theorem

The square of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the other two sides. more......

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