Re: Scalar waves

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.
I personally dislike the so called 'imperial units'. But those are consistent and well defined, too.
Or you invent something on your own and use that.

For example, your tape rule, or balance, or... may have a marking
that says 'not for purposes of trade'.
What it says is an impression only.
Selling goods using it is illegal,
and will be punishable.

Science and trade are not exactly the same thing.
Sure, for trade, especially international trade, you need agreements about the used measures.
But that is a different topic and political in nature.

BTW, setting standards for weights and measures
is one of the oldest functions of the state,
going back as least 4 000 years,
 

Sure.
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.
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.
TH