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From: nospam@de-ster.demon.nl (J. J. Lodder)
Newsgroups: sci.physics.relativity
Subject: Re: Scalar waves
Date: Tue, 7 May 2024 18:42:30 +0200
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Reply-To: jjlax32@xs4all.nl (J. J. Lodder)
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Thomas Heger <ttt_heg@web.de> wrote:

> Am Montag000006, 06.05.2024 um 13:52 schrieb J. J. Lodder:
> > Mikko <mikko.levanto@iki.fi> wrote:
> > 
> >> On 2024-05-06 09:36:27 +0000, J. J. Lodder said:
> >>
> >>> A measurement is not a measurement unless it can be traced
> >>> to a primary standard.
> >>> So your multimeter measures 204.5 mA when it says so
> >>> because the manufacturer of it says so.
> >>> Your manufacturer can guarantee that,
> >>> because he has calibrated the thing
> >>> against his standard ampere meter.
> >>> He knows that his standard meter measures amps
> >>> because he takes it to his national standards lab,
> >>> where they calibrate it for him.
> >>> And ultimately (if you live in a small country)
> >>> your national lab takes their standards to NIST, or BIPM,
> >>> where they do have a primary standard.
> >>
> >> Possibly. Or the manufacturer or certifier or the national
> >> laboratory may have a reference that they compare directly
> >> to the definition.
> > 
> > Certainly. Whatever,
> > the point is and remains that a measurement isn't a measurement
> > unless it can be traced to an SI standard.
> > In many cases this is even required by law.
> > Whatever is doing the calibrating must be a state-approved agency.
> 
> Well, no!
> 
> You can use any other consistent system of units, if you don't like 
> SI-units.

Certainly, and you can use any other system of dimensions
than the one that is conventionally associated with the SI.

> But actually I was talking about dimensions and how those are defined.
> 
> That term refers to WHAT is measured, while units define the quantities
> of the measurement results.

Sure, you can invent your own definitions,
but that is not how the term 'dimension' is used in physics.

> Simple example:
> 
> you have a distance of roughly 1 meter and want to measure that.
> 
> you could use inch, yards, forlongs, lightseconds, Angstroem, mm and the
> size of the emperors feet.
> 
> The choice of a unit would only influence the numerical value, but not
> the measured distance.

You forget the only length unit that is still in everyday use,
the second, up to an unconvenient conversion factor.
Do I really need to remind you again that the meter has been abolished
as a primary standard, and that all length measurements
must (by the definition of the meter) be calibrated in seconds?

And yes, that includes your tape rule,

Jan