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Mineral Hardness (171 words) |
 | Hardness is measured by the resistance which a smooth surface offers to abrasion. |
| The degree of hardness is determined by observing the comparative ease or difficulty which which one mineral is scratched by another. |
| The selection of mineral species for hardness standards is based on the common availability of the mineral. |
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Hardness (654 words) |
| Hardness is a measure of dissolved mineral salts, mainly calcium and magnesium carbonates, in water. |
| Hardness has a direct affect on the cellular functions of fish, plants and microorganisms and although fish from hard water areas do not seem to suffer from softer than natural conditions the reverse does not apply. |
| Hardness is expressed in degrees but the units differ form country to country and test kit measurements vary depending on whether total hardness or carbonate hardness is being determined. |
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