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<p>[QUOTE=&quot;Publius2, post: 8046968, member: 105571&quot;]That is why I was working toward a dimensionless geometric definition with L/D ratio calculations.&nbsp; Not that that is intended to be the end-all of the conversation since this is very interesting.</p><p><br /></p><p>BTW, I don&#039;t think [USER=24314]@Insider[/USER] asked anything about the grading aspect when he posed the question.&nbsp; I think talking about grading distracts from his original intention.</p><p><br /></p><p><br /></p><p><br /></p><p>I have two quibbles with this definition:&nbsp; First, I don&#039;t think high pressure is a requirement (think staple scratch) and cannot be determined after the fact in any event.&nbsp; Secondly, while raised edges are a typical characteristic of a scratch, they are not universally in evidence.&nbsp; So, any criteria that does not exist at all times cannot be a fundamental characteristic of the phenomenon.[/QUOTE]</p><p><br /></p>

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