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Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. [1] Attempting to scratch a surface to test a material is a very old technique. [2]
The Turner-Sclerometer test consists of measuring the amount of load required to make a scratch. [1] [2] In test a weighted diamond point is drawn, once forward and once backward, over the smooth surface of the material to be tested. The hardness number is the weight in grams required to produce a standard scratch.
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The gold-leaf electroscope was one of the instruments used to indicate electric charge. [1] It is still used for science demonstrations but has been superseded in most applications by electronic measuring instruments.
4 Ways To Keep Your Greens Fresh for Longer. Too much moisture is what causes leafy greens to turn soft and rot.Here are four ways to keep moisture at a minimum:
Kurtis Rourke injury: Indiana QB reportedly played through ...
Scratch-and-sniff stickers are occasionally used to help diagnose anosmia, [8] [9] though the Alcohol Sniff Test,which uses vaporised 70% isopropyl alcohol, is far more common. [ 10 ] [ 11 ] Some utility companies enclosed scratch and sniff cards in their bills to educate the public in recognizing the smell of a methane gas leak.
A teenager has died after the car he was traveling in crashed into a sewage plant. The 18-year-old boy was found dead after the Volkswagen Golf was discovered “partly submerged” at the water ...