Science / Chemistry / Carbonate Hardness: Water hardness due to the presence of calcium and magnesium carbonates and bicarbonates. The 'noncarbonate hardness' is due mostly to calcium and magnesium sulfates, chlorides, and nitrates.
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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
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 / Geology / Mohs Hardness Scale: A collection of minerals ranging from very soft to very hard. Use as a comparison scale during mineral identification. From softest to hardest, the ten minerals are: talc 1, gypsum 2, calcite 3, fluor MORE
Entertainment / Photography / Potassium Carbonate: Highly soluble alkaline accelerator used in most general purpose and print developing solutions. 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