Difference between revisions of "For all practical purposes"
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'''FAPP … for all practical purposes''' <br> | '''FAPP … for all practical purposes''' <br> | ||
| − | + | Probability of exceptions may not be truly zero but it could as well be. <br> | |
FAPP is usually used such: <br> | FAPP is usually used such: <br> | ||
Whatever the deviation from the ideal, <br> | Whatever the deviation from the ideal, <br> | ||
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With current day technology (2023) creating a perfect vacuum is not at all possible. <br> | With current day technology (2023) creating a perfect vacuum is not at all possible. <br> | ||
Ok, Except in the inside of a buckyball, but that's not what one usually thinks of. <br> | Ok, Except in the inside of a buckyball, but that's not what one usually thinks of. <br> | ||
| + | <small>(And even there there's some rather very small probability of a He atom tunneling in. Digressing.)</small> <br> | ||
Rather one thinks of UHV systems out of steel that can be heated to get rid of adsorbed gas molecules. <br> | Rather one thinks of UHV systems out of steel that can be heated to get rid of adsorbed gas molecules. <br> | ||
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Free floating atoms are way easier to get into quantum regime than solid state nanomachinery. <br> | Free floating atoms are way easier to get into quantum regime than solid state nanomachinery. <br> | ||
See: [[Nanomechanics is barely mechanical quantummechanics]] | See: [[Nanomechanics is barely mechanical quantummechanics]] | ||
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| + | == Example Diffusion on of carbon atoms on diamond surfaces at room temperature. == | ||
| + | |||
| + | Due to the exponential drop-off of diffusion rates with height of energy barriers <br> | ||
| + | there can be (and in this case is) [[FAPP]] no diffusion to the point of <br> | ||
| + | other mechanisms of atom displacement vastly dominating ([[radiation damage]]). <br> | ||
| + | |||
| + | Also covered in a "thermodynamics forbids APM - false" subsection on the page: <br> | ||
| + | [[Common misconceptions about atomically precise manufacturing]]. | ||
== Related == | == Related == | ||
Latest revision as of 13:54, 6 October 2024
FAPP … for all practical purposes
Probability of exceptions may not be truly zero but it could as well be.
FAPP is usually used such:
Whatever the deviation from the ideal,
its so extremely small that it does not matter at all
for all practical purposes.
"FAPP impossible" => See page: Impossible
(wiki-TODO: Extend on the page intro.)
Example UHV vs PPV
With current day technology (2023) creating a perfect vacuum is not at all possible.
Ok, Except in the inside of a buckyball, but that's not what one usually thinks of.
(And even there there's some rather very small probability of a He atom tunneling in. Digressing.)
Rather one thinks of UHV systems out of steel that can be heated to get rid of adsorbed gas molecules.
With future advanced APM (gemstone metamaterial technology)
PPV will be possible though. And not just for nanoscale spaces,
but also for much bigger ones micro, meso, and maybe even macro.
One will often run in situations where there are FAPP no atoms in a chamber.
Math may give a very very tiny fraction of a single atom. Atoms don't come in fractional quantities.
Well, ok, in a quantum sense they can so long their quantum dispersed wave function does not get collapsed.
delaying wave-collapse is hard to do if desired (as it is in quantum computers).
Free floating atoms are way easier to get into quantum regime than solid state nanomachinery.
See: Nanomechanics is barely mechanical quantummechanics
Example Diffusion on of carbon atoms on diamond surfaces at room temperature.
Due to the exponential drop-off of diffusion rates with height of energy barriers
there can be (and in this case is) FAPP no diffusion to the point of
other mechanisms of atom displacement vastly dominating (radiation damage).
Also covered in a "thermodynamics forbids APM - false" subsection on the page:
Common misconceptions about atomically precise manufacturing.
Related
- Special:WhatLinksHere/For_all_practical_purposes – quite a nuber of pages lead here
