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

 

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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.

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 . . . View Full Definition

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 Commo . . . View Full Definition

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.

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 correspon . . . View Full Definition

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 i . . . View Full Definition

Temporary Hardness: The component of total water hardness that can be removed by boiling the water. Ca(HCO3)2 and Mg(HCO3)2_ are responsible for temporary hardness.

Semi-Permanent Pressure Systems: A relatively stable, stationary pressure-and-wind system where the pressure is predominately high or low with the changing season. They are not of a transitory nature, like migratory lows th . . . View Full Definition

Permanent Insurance: Permanent insurance is a life insurance policy that provides a death benefit as long as you live, or in some cases until you turn 100, provided you continue to pay the required premiums. Wit . . . View Full Definition