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From: nospam@de-ster.demon.nl (J. J. Lodder)
Newsgroups: sci.physics.relativity
Subject: Re: Scalar waves
Date: Wed, 1 May 2024 09:46:09 +0200
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Thomas Heger <ttt_heg@web.de> wrote:

> Am Mittwoch000001, 01.05.2024 um 07:27 schrieb Ross Finlayson:
> > On 04/29/2024 11:10 PM, Thomas Heger wrote:
> >> Am Dienstag000030, 30.04.2024 um 07:55 schrieb Thomas Heger:
> >>> Am Montag000029, 29.04.2024 um 15:28 schrieb Ross Finlayson:
> >>>
> >>>>>
> >>>>
> >>>>
> >>>> It's rather as there's a physical constant.
> >>>>
> >>>> It's 1.0. In natural units, it's infinity.
> >>>>
> >>>> Or, there's a physical constant.
> >>>>
> >>>> It's infinity. In natural units, it's 1.0.
> >>>
> >>>
> >>> I don't like this 'c=1 thing', because 1 is a natural number, while
> >>> speed/velocity have physical dimensions with v = dx/dt.
> >>>
> >>> Because time and distance are not measured with the same units, c had
> >>> to have units.
> >>>
> >>> Now 1 has no units whatsoever (because it is just a number) you cannot
> >>> say, that c is one.
> >>>
> >>> Actually meant were:
> >>>
> >>> lightyears and years.
> >>>
> >>> And c = 1 lightyear/year
> >>>
> >>> This is (trivially) true, but has units.
> >>>
> >>> TH
> >>> ...
> >>
> >> The reason to require a unit for c:
> >>
> >> EVERY physical quantity is composed from a numerical value and a unit!
> >>
> >> In case you would like to use something called 'natural unit(-s)' as
> >> unit, this would be perfectly ok, but only if - say - 'nu' is properly
> >> defined.
> >>
> >> If you like to define 'nu' you would end up in a dilemma, because c is
> >> assumed to be 1 one these natural units.
> >>
> >> That would be a definititon, which is based on itself (what is not
> >> allowed).
> >>
> >> Such a 'circular' definition is something, which is referring to itself.
> >>
> >> Such definitions violate important principles of logic.
> >>
> >>
> >> TH
> >>
> > 
> > 
> > The dimensional analysis of course is the attachment of a mathematical
> > model to a physical model at all, then with regards to usual
> > "dimensions" being quantitative and geometrical.
> > 
> > 
> > The dimensionless really does have any number of "balanced implicits"
> > in it. Any sort of "1 unit/unit" is a thing, and as well in the
> > quantities, "1 goes-to-1-from-the-left/goes-to-1-from-the-right",
> > sort of arrives at the same thing.
> 
> 
> Well, in reality 1 means a natural dimensionless number.

Nonsense. That 'dimensionless' doesn't belong there.
And 1 being a natural number doesn't have a meaning.
It is, by the mathematical definition of natural number.

> Having no units says, that c is unitless and has only the numerical value 1.

Your misunderstandings in a nushell.
All it says is that 'length' and 'time' are measured in the same unit.
(apart from an inconvenient numerical factor)

This is precisely what all working physicists have been doing
ever since the abolition of the meter as an independent unit
at the 17th CIPM, 1983.

Jan

-- 
[snip more misunderstandings]