Group: sci.physics.particle
From: "Y.Porat"
Date: Thursday, November 29, 2007 6:57 AM
Subject: Re: Why do crystals always have straight edges?

On Nov 28, 6:48 pm, "Androcles" wrote:
> "hanson" wrote in message
>
> news:AIg3j.31237$dh.31139@trnddc05...: "Androcles" wrote in message
>
> :news:vm23j.4020$EU1.2501@fe1.news.blueyonder.co.uk...
> : >
> : > : "Sam Wormley" wrote in message
> : > :news:ym%2j.200989$Xa3.64733@attbi_s22...
> : > : >
> : > : [Albert wrote]:
> : > : Why do crystals always have straight edges? I'm only in Year 8
> : > : Australia studying particles.
> : > : >
> : > : [Uncle rect-Al Schwartz]
> : > : All periodic crystals reduce to a tiny single unit cell that is
> : > : gaplessly stacked in 3-D to make the bulk. There are 230 periodic
> : > : crystallographic space groups. Each and every one has a
> : > : parallelepiped unit cell with sides a,b,c and angles alpha,beta,gamma.
> : > : When you gaplessly self-simlarly stack parallelepipeds you invariably
> : > : get straight edges.
> : > : >
> : > : [Sam]
> : > : I've seen single crystal turbine blades... all edges curved.
> : > :http://images.google.com/images?q=single+crystal+turbine+blade
> : > : >
> : > : [hanson]
> : > : ... ahahahaha... AHAHAHAHA.... well, so much for theory again
> : > : and rect-Al-ly buzz-wording about it with absolute certainty and
> : > : "gapless parallelepipeds" ... especially when "empirical"
> : > : observation shows the opposite.
> : > :
> : [Andro]
> : > Unfortunately it comes down to picking nits. A worn
> : > tyre is round but a new tyre isn't, it is covered with sprews.
> : > Likewise the single crystal turbine blade has planar facets,
> : > however small they may be, right down to the atomic level.
> : > Any two points define a straight line, any three points define
> : > a plane. The intersection of two planes is an edge.
> : > I doubt it is worth debating whether an atom is a point,
> : > sphere, cube or polyhedron.
> : > What is important to the young teenager is that crystals are
> : > indeed faceted.
> : > As much as I detest the idiotic bastard, I have to be fair.
> : > ---------------------------------
> : > Schwartzshit 1 - Worms 0
> : > ---------------------------------
> : > Even a blind squirrel finds a nut sometimes.
> : >
> : [hanson]
> : ahahaha... That is too much!... ahahaha... you must admit
> : that a tyre, even if it's a US tire, is a rather larger nit you have
> : picked for coming to uncle rect-Al's rescue because, a case
> : can be made that Sam produced illustrated precedences for
> : his claim. OTOH there are no references for single-crystal
> : tires or tyres... However, Schartzshit will adore you in undying
> : fartitude for you fair and valiant rescue attempt and he may
> : refrain from calling you clitter/cluttering names of unintended
> : glory from now on ... Thanks for the laughs, guys!... ahahanson
> :
> Schwartzshit or Wormsy... neither one is logical, I can afford
> to be impartial on that one. Wormsy is right that a turbine blade
> is a single crystal of unalloyed titanium, but that means a lattice!
> Your greatest admirer and "Totally queer arse humper"
> trave...@noasskissers.net knows all about lattices when he stated
> his heartfelt desire and declared his homosexuality innews:3r4ki3539l40nrg6f1b0v2kec49jpng7tl@4ax.com...
> : ahahaha... Bend over, Wabi. I'll show you some coordinates. ahahaha...
> : AHAHAHA... ahahaha..."

------------------
Mr Andricless
one you dont know - say i dont know:

crystals do not have 'faces'!!
they have only jionts
the faces that afre covering those joints
ARE IMMAGINARY !!!

now-- no rolling blades ans no shmoling ones
nothing is rotating there
if it was rotating you would be a big mesh potato .

the electron does not rotale or orbit all around the nuc
just atick it once and for all into yuour head .
th emost they move in a latice is sort of vibration
if you like - like a held string
( nad th eelectron is not a point particle )

ATB
Y.Porat
-----------------------------------------..

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