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NNTP-Posting-Date: Wed, 08 May 2024 20:13:42 +0000
Subject: Re: Scalar waves
Newsgroups: sci.physics.relativity
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From: Ross Finlayson <ross.a.finlayson@gmail.com>
Date: Wed, 8 May 2024 13:13:43 -0700
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On 05/08/2024 05:52 AM, J. J. Lodder wrote:
> Mikko <mikko.levanto@iki.fi> wrote:
>
>> On 2024-05-07 07:43:50 +0000, Thomas Heger said:
>>
>>> 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.
>>
>> In a measurement only one unit is used so there is no requirement on system.
>
> Right. Only final results of measurements should be converted.
> Our American frieds may have problems with this,
> so they may crash a Mars lander every now and then.
> And aforteriori, there is never any need for any 'dimension'
> in anny measurement proces.
> The main use of 'dimensions' is to have something
> to teach to the kiddies, to set exam questions about.
> Real scientists don't need them to know what to do.
>
>>> But actually I was talking about dimensions and how those are defined.
>>
>> You need not use a defined system of dimensions. You may define your own
>> dimension system. For example, you can define a system whith different
>> dimensions for horizontal and vertical distances.
>
> Indeed, 'pilots units' from one of my postings of long long ago.
> Pilots measure vertical distances in feet,
> and horizontal distances in (nautical) miles.
> So their glide angle is in feet per mile. [1]
> Whether or not you define a systems of dimensions
> to go with those units is, just like you say, optional.
>
> Jan
>
> [1] Real piots do have a very good idea of what the value of it is.
> It really helps when you are going to park your Airbus,
> in the Hudson river.
>

The usual notion of various coordinate settings,
each having a metric and norm in the near and far field,
yet, only after some affine (if that) transformation,
or even the "non-linear" or "highly-non-linear" in
the dynamics of the relativistic extremes, resulting
yet all what is overall an isotropic and flat space-time,
makes that tensors are a very general claim of the
conformal mapping, with regards to, Regge map and Ricci tensor.

In my podcasts besides reading Einstein and into space-contraction
for Einstein's bridge, then these days is ponderance of the
classical mechanics, with regards to, nominally non-zero
infinitely-many higher orders of acceleration, in any change,
as about any moment, of all motion.

So, besides issues with relativistic mechanics,
is that physics and science still has debts owed
by mathematics, to even effectively reflect
classical mechanics.

All according to dimensional analysis, of course, ...,
due the ubiquitous success of mathematics in the
mathematical physics, the science.

Theoretical and empirical, ....