View source for For all practical purposes

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'''FAPP … for all practical purposes''' <br>
It may not be truly zero but it could as well be. <br>
FAPP is usually used such: <br>
Whatever the deviation from the ideal, <br>
its so extremely small that it does not matter at all <br>
for all practical purposes.

"FAPP impossible" => See page: [[Impossible]]

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== Example UHV vs PPV ==

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>
Rather one thinks of UHV systems out of steel that can be heated to get rid of adsorbed gas molecules. <br>
----
With future advanced [[Main Page|APM]] ([[gemstone metamaterial technology]]) <br>
[[PPV]] will be possible though. And not just for nanoscale spaces, <br>
but also for much bigger ones micro, meso, and maybe even macro. <br>

One will often run in situations where '''there are [[FAPP]] no atoms in a chamber'''. <br>
Math may give a very very tiny fraction of a single atom. Atoms don't come in fractional quantities. <br>
Well, ok, in a quantum sense they can so long their quantum dispersed wave function does not get collapsed. <br>
delaying wave-collapse is hard to do if desired (as it is in quantum computers). <br>
Free floating atoms are way easier to get into quantum regime than solid state nanomachinery. <br>
See: [[Nanomechanics is barely mechanical quantummechanics]]

== Related ==

* [[practically perfect vacuum]]
* [[Impossible]]