How does a metal knife not scratch a glass phone screen?
You can check the answer of the people under the question at Quora “phone knife“
About Autumn
Written by: Autumn
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How does a metal knife not scratch a glass phone screen?
You can check the answer of the people under the question at Quora “phone knife“
About Autumn
Because the phone screen is not glass. For the last five years, most have been artificial sapphire – so 9 on the Mohs scale.
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You will only get scratching of the glass if you use an implement that is harder than glass. Most metals and alloys are softer than glass.
However, sometimes an animal’s claw (much softer than glass) is able to mark, by scratching, a glass surface. This is possible because the claw contains ingrained and microscopic particles of grit that have harder surfaces than that of glass and also happen to be extremely sharp.
You should not confuse marking of glass by softer metals. This occurs when the metal gets transferred to the glass sacrificially and can be ‘wiped’ off. Lead pencils were referred to as such because the softness of elemental lead was noted by the ancient Romans who used a ‘Stylus’ made of lead capable of writing on a suitable substrate.
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It depends on the metal. Try a titanium carbide. Steel is softer than glass. Titanium, being softer than steel, marks the glass, kind of indelibly paints it.
Why titanium “writes” on glass , meanwhile don’t scratching it?
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