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HA, or Hardness Absolute, is a hardness measurement scale used for very hard materials like ceramics, where traditional scales like Rockwell or Vickers might not be suitable. It measures the material's resistance to plastic deformation by pressing a diamond cone into the surface. The higher the HA number, the harder the material.

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1y ago

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Why pH is 10 for finding the hardness of water .something related to protonation?

A pH of 10 is often used when testing water hardness because it ensures that all carbonates and bicarbonates present in the water are fully ionized, allowing for accurate measurement of the total hardness. At this pH, the calcium and magnesium ions in the water form insoluble precipitates, which can be quantified to determine the hardness level. The high pH also helps to minimize interference from other ions in the water on the hardness measurement.


What is the limitations on the thickness of specimens for hardness test?

The thickness of specimens for hardness testing should generally be at least ten times the depth of the indentation created by the hardness test method. Thicker specimens may not allow for accurate measurement of hardness due to potential effects of surface irregularities or variations in material properties throughout the thickness of the specimen. Additionally, thinner specimens may not provide enough material for the hardness testing equipment to produce reliable results.


What is the hardness of Limonite on the mohs hardness scale?

The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.


What is a sentence with the word hardness?

no one likes your Hardness! hardness is not a good character.


Is hardness property of elements?

Pure materials, especially minerals, are measured on a hardness scale. There are three basic tests: indentation hardness, scratch hardness and rebound hardness. See Wikipedia