Articles related to hardness
Mohs Scale of Hardness - Identify Rocks & Minerals - Chemistry
The Mohs Scale of Hardness measures how well a substance resists scratching by another material. You can use this scale to test the hardness of rocks, ...
How to Perform the Mohs Hardness Test - Chemistry - About.com
The Mohs test is one way to determine the hardness of a rock or mineral. You can use the Mohs hardness to help identify an unknown specimen.
Mineral Identification - Step 3: Hardness - Geology - About.com
Hardness, as measured with the 10-point Mohs scale, is very important to know for mineral identification.
Mohs Hardness Scale of Minerals - Geology - About.com
You use the Mohs hardness scale by testing your unknown mineral against one of these standard minerals. Whichever one scratches the other is harder, and if ...
The Mohs Hardness of Coins - Geology - About.com
The Mohs scale of mineral hardness consists of ten different minerals, but some other common objects can also be used: these include the fingernail (hardness ...
What's the Mohs Scale of Mineral Hardness? - Jewelry - About.com
The Mohs Scale is used to rank minerals by their hardness. Knowing where gemstones rank on the scale is an important factor in their care.
Test for Hard Water - Water Hardness - Home Repair - About.com
This tutorial describes a home test to determine if you have hard water.
What Is the Hardness Scale for Minerals? Video
Mineral hardness is rated on a scale developed by mineralogist Frederich Mohs. Learn about the Mohs scale of mineral hardness in this educational geology ...
Tutorial on How to Test for Hard Water - Home Repair - About.com
Hard water is anything above 1 grain of hardness per gallon. (A grain of hardness is an amount of calcium and magnesium equal in weight to a kernel of wheat).
Wood Flooring - Janka Hardness Rating - Home Repair - About.com
The relative hardness of wood species is measured using what is called a Janka Hardness Rating. This test measures the force needed to embed a steel ball ...