Re: How Can You Scratch A Sapphire Crystal? While I have never actually heard of this happening, I find it plausible. Looking at the Mohs hardness scale (which is a relative scale, not absolute: IE: a 2 is not necessarily TWICE as hard as a 1), we find that Sapphire is a 9, and diamond is a 10. It's generally assumed that any substance with a higher number can put a scratch on anything with a lower number. What catches my attention is that silicon carbide is a 9.4 or so. This material is widely used in abrasives, such as sandpaper.
noun. The definition of conventional wisdom refers to something that is widely accepted as true or correct or proper. An example of conventional wisdom is the idea that if you work hard you will succeed.ords near conventional wisdom in the dictionary. 1  conventional-wars. 2  conventional-weapon. 3  conventional-weaponry. 4  conventional-weapons. 5  conventional wisdom. 6  conventionalise. 7  conventionalised. 8  conventionalises. 9  conventionalising. 10  conventionalism.
Back to Top. 1  Moral Skepticism is the belief that moral knowledge is either nonexistent or unattainable. 2  Religious Skepticism (or Theological Skepticism) is Skepticism regarding faith-based claims. 3  Metaphysical Skepticism is a type of local skepticism which denies any metaphysical knowledge. 4  Scientific Skepticism (or Empirical Skepticism) is the ...keptics oppose Foundationalism (the idea that some basic beliefs that are self-justified or beyond justification) in that they argue that the belief in something does not necessarily justify an assertion of knowledge of it. It has been said of the early Skeptics that they asserted nothing, but only opined .