Business / Machine Shop / Brinell Hardness: A method of testing the hardness of a metal by controlled pressure of a hardened steel ball of a given size.
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Business / Machine Shop / Brinell Hardness Test: A common testing method using a ball penetrator. The diameter of the indentation is converted to units of Brinell hardness number (BHN). MORE
Science / Chemistry / Permanent Hardness: Water hardness that remains after boiling the water, mainly due to dissolved calcium sulfate. Chlorides also contribute to permanent hardness. MORE
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
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
Science / Geology / Mohs Scale Of Hardness: An empirical, ascending scale of mineral hardness with talc as 1, gypsum 2, calcite 3, fluorite 4, apatite 5, orthoclase 6, quartz 7, topaz 8, corundum 9, and diamond 10. MORE
Science / Chemistry / 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. MORE