Related Words

Air space : The area between insulation facing and interior of exterior wall coverings. Normally a 1' air gap.

Double Glass: Window or door in which two panes of glass are used with a sealed air space between. Also known as Insulating Glass.

Insulating Glass: Window or door in which two panes of glass are used with a sealed air space between. Also known as Double glass.

Permanence Tests: Methods of establishing whether long term permanence of an image has been achieved.

Permadeath: A blend of 'permanent' and 'death.' The act of a player choosing to have his character be killed off for good, and not revived or respawned in any way.

PERLS: Principal Exchange-Rated-Linked Securities

Permanent Current: A current that runs continuously and is independent of tides and other temporary causes. Permanent currents include the general surface circulation of the oceans.

Permalloy Tape Head: A cassette tape head constructed of permalloy, an alloy made primarily of nickel and iron, used for its superior high wear resistance and permeability, offering superior frequency response a . . . View Full Definition

Permanent Hardness: Water hardness that remains after boiling the water, mainly due to dissolved calcium sulfate. Chlorides also contribute to permanent hardness.

Permanent Teeth: The thirty-two adult teeth that replace the baby, or primary teeth. Also known as secondary teeth.