<p>You have object A of hardness 4 and glass B of hardness 6.
Is this information alone enough to determine that, under any circumstances object A will never be able to scratch glass B?</p>

<p>For a more practical example, does this mean that it doesn't matter how hard you press, how fine the point of the object is, how long you keep scratching on B's surface, etc. a cat claw for example will never leave a scratch on a hardness 5 phone glass?
Or is it just like un-noticeable/negligible?</p>

<p>This doesn't seem to make sense on an atomic scale, since both A and B should be losing loose atoms from their interaction.</p>

<mineralogy>
Does higher hardness means that A cannot scratch B regardless of any other variable?
user361323
# Does higher hardness means that A cannot scratch B regardless of any other variable?

(Asked by: username_0 on 2020-04-18)

You have object A of hardness 4 and glass B of hardness 6.
Is this information alone enough to determine that, under any circumstances object A will never be able to scratch glass B?

For a more practical example, does this mean that it doesn't matter how hard you press, how fine the point of the object is, how long you keep scratching on B's surface, etc. a cat claw for example will never leave a scratch on a hardness 5 phone glass?
Or is it just like un-noticeable/negligible?

This doesn't seem to make sense on an atomic scale, since both A and B should be losing loose atoms from their interaction.

**Tags:** mineralogy


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## 0 answers

