XPost: sci.electronics.design
From: bill.sloman@ieee.org
On 25/02/2026 1:15 am, J. J. Lodder wrote:
> Bill Sloman wrote:
>
>> On 24/02/2026 10:40 pm, J. J. Lodder wrote:
>>> Bill Sloman wrote:
>>>
>>>> On 24/02/2026 4:26 am, Ross Finlayson wrote:
>>>>> On 02/23/2026 08:46 AM, Ross Finlayson wrote:
>>>>>> On 02/23/2026 03:28 AM, J. J. Lodder wrote:
>>>>>>> Ross Finlayson wrote:
>>>>>>>
>>>>>>>> On 02/22/2026 07:42 AM, Bill Sloman wrote:
>>>>>>>>> On 22/02/2026 10:24 pm, Ross Finlayson wrote:
>>>>>>>>>> On 02/22/2026 03:11 AM, Ross Finlayson wrote:
>>>>>>>>>>> On 02/22/2026 01:20 AM, Bill Sloman wrote:
>>>>>>>>>>>> On 22/02/2026 6:18 pm, Ross Finlayson wrote:
>>>>>>>>>>>>> On 02/21/2026 08:27 PM, Bill Sloman wrote:
>>>>>>>>>>>>>> On 22/02/2026 12:06 am, Ross Finlayson wrote:
>>>>>>>>>>>>>>> On 02/21/2026 04:23 AM, Bill Sloman wrote:
>>>>>>>>>>>>>>>> On 21/02/2026 4:31 pm, Ross Finlayson wrote:
>>>>>>>>>>>>>>>>> On 02/20/2026 08:39 PM, Bill Sloman wrote:
>>>>>>>>>>>>>>>>>> On 21/02/2026 3:46 am, john larkin wrote:
>>>>>>>>>>>>>>>>>>> On Fri, 20 Feb 2026 18:32:18 +1100, Bill Sloman
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>>>>>>>> On 20/02/2026 3:54 am, john larkin wrote:
>>>>>>>>>>>>>>>>>>>>> On Thu, 19 Feb 2026 14:13:06 +0100,
>>>>>>>>>>>>>>>>>>>>> nospam@de-ster.demon.nl
>>>>>>>>>>>>>>>>>>>>> (J. J.
>>>>>>>>>>>>>>>>>>>>> Lodder) wrote:
>>>>>>>>>>>>>>>>>>>>>> Bill Sloman wrote:
>>>>>>>>>>>>>>>>>>>>>>> On 19/02/2026 9:56 pm, J. J. Lodder wrote:
>>>>>>>>>>>>>>>>>>>>>>>> Bill Sloman wrote:
>>>>>>>>>>>>>>>>>>>>>>>>> On 19/02/2026 7:49 am, Ross Finlayson wrote:
>>>>>>>>>>>>>>>>>>>>>>>>>> On 02/18/2026 12:43 PM, Python wrote:
>>>>>>>>>>>>>>>>>>>>>>>>>>> Le 18/02/2026 à 20:13, Ross Finlayson a écrit :
>>>>
>>>>
>>>>
>>>>>> NIST PDG CODATA posts updated values of physical constants
>>>>>> every few years, that over time have gotten smaller besides
>>>>>> more precise: what kind of science are they doing that
>>>>>> that is your entire world-view.
>>>>>>
>>>>>>
>>>>>> So, it "is" an analysis of the coordinates and origin and
>>>>>> identity and dimensions about the mathematical and physical
>>>>>> constants of the running constants or "change". It "is"
>>>>>> a gauge theory. It "is" a continuum mechanics.
>>>>>>
>>>>>> It "is" a bit more than 11'th graders' linear algebra,
>>>>>> and Buckingham-Pi "dimensionless" analysis.
>>>>>>
>>>>>> Heh. At least first it's a true theory with the
>>>>>> universe of mathematical objects in it.
>>>>>
>>>>> What, you thought Boltzmann constant was a
>>>>> purely physical constant?
>>>>>
>>>>> https://en.wikipedia.org/wiki/Boltzmann_constant
>>>>
>>>> Most people who know anything about physics have that idea.
>>>
>>> Real physicists understand what are real physical constants,
>>> like \alpha for example, and which constants are meaningless, like c,
>>> because they you tell one about what units you are using.
>>
>> The exact numerical value of c has mattered to me from time to time.
>
> Good for you that c has an exact numerical value, these days.
>
>> Being human, I have to measure things in units, and transform that
>> measured distance into a propagation delay.
>
> There is nothing but a propagation delay.
But I couldn't measure that all that accurately, and I need at least a
rough value for the propagation delay before I could build the hardware
on which I could have measured the propagation delay.
> Length is by definition measured in (nano)seconds.
> Anyone who thinks different is fooling himself.
You may have a preference for expressing it in nanoseconds, but
machinists prefer millimeters. I found it politic to keep them happy.
At least one engineer I knew complained that he was nothing but a
walking table of conversion factors. Life would be easier if that was
the whole job.
--
Bill Sloman, Sydney
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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