Permanent Hardness

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

Other Words for Permanent

Permanent Noun Synonyms: unchanging, invariable, changeless, fixed, unchangeable, immutable, unalterable, stable, persistent
Permanent Adjective Synonyms: everlasting, eternal, unending, endless, perpetual, unceasing, constant, undying, imperishable, indestructible, stable, abiding, long-lasting, lasting, enduring, perennial, long-lived, durable
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Permanent Teeth

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

Permanent Magnet Synchronous (PMR)

Technology / Motors / Permanent Magnet Synchronous (PMR): (HYSTERESIS SYNCHRONOUS) A motor with magnets embedded into the rotor assembly, which enable the rotor to align itself with the rotating magnetic field of the stator. These motors have zero slip (cons MORE

Permanent Law

Business / Agriculture / Permanent Law: Legislation that would be in force in the absence of all temporary or short-term laws (e.g., farm bills). The Agricultural Adjustment Act of 1938, the Agricultural Act of 1949, and the Commodity Credi MORE

Permanent Vegetative Cover

Business / Agriculture / Permanent Vegetative Cover: Trees, or perennial grasses, legumes, or shrubs with an expected life span of at least 5 years. Permanent cover is required on cropland entered into the Conservation Reserve Program. MORE

Rockwell Hardness Test

Business / Machine Shop / Rockwell Hardness Test: The most common hardness testing method. This procedure uses a minor load to prevent surface irregularities from affecting results. There are nine different Rockwell hardness tests corresponding to co MORE

Water Hardness

Science / Chemistry / Water Hardness: Hard water is water contaminated with compounds of calcium and magnesium. Dissolved iron, manganese, and strontium compounds can also contribute to the 'total hardness' of the water, which is usually MORE

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