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From: nospam@de-ster.demon.nl (J. J. Lodder)
Newsgroups: sci.physics.relativity
Subject: Re: Scalar waves
Date: Mon, 6 May 2024 11:36:28 +0200
Organization: De Ster
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Reply-To: jjlax32@xs4all.nl (J. J. Lodder)
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Thomas Heger <ttt_heg@web.de> wrote:

> Am Sonntag000005, 05.05.2024 um 23:18 schrieb J. J. Lodder:
> 
> >>>>>
> >>>>> 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.
> >>>
> >>> You really need to work on your misunderstandings about units and
> >>> dimensions.
> >>> In particular, physical quantities do not -have- a dimension.
> >>> Conversely dimension is not a property of physical quantity.
> >>> You cannot measure a dimension.
> >>
> >> Sure, you measure physical quantities.
> >>
> >> Lets say: you measure a current in Amperes.
> >>
> >> Then the measurement of - say- 100 mA means, that a certain electrical
> >> current has a current strength of 100 mA.
> >>
> >> Now 'current strength' is the quantity which is measured. This current
> >> strength is then the dimension of the measurement and the value depends
> >> on the used units, which are Ampere in this case.
> > 
> > See? You are hopelessly confused betwen units and dimensions.
> > What you measure is a current in Amps.
> > One may asign a dimension [Current] to the unit Ampere.
> 
> No, that's  wrong.
> 
> Any measurement measures something real.

One can hope so.

> This measured something is the real entity and has some attributes, 
> which we can eventually measure.
> 
> So we have e.g. some current in a wire and want to measure the strength
> of this current.
> 
> The current strength is an attribut of the electric current, but no 
> current itself.
> 
> Therefore the Ampere measures the strength of electrical current, which
> is therefore the dimension, to which the unit Ampere belongs.

DO look up what physicists mean when they use the word 'dimension'
in the context of unit systems.

It is not your fantasy meaning,

Jan

> ...