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From: Thomas Heger <ttt_heg@web.de>
Newsgroups: sci.physics.relativity,sci.physics,sci.math
Subject: Re: ? ? ?
Date: Thu, 21 Mar 2024 07:37:54 +0100
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Am 17.03.2024 um 10:05 schrieb Chellos Leontarakis:
> Thomas Heger wrote:
>
>>> not in physics, my friend. Try 𝙣𝙚𝙬_𝙖𝙜𝙚, 𝙘𝙖𝙗𝙗𝙖𝙡𝙖𝙝 etc, but that's
>>> stupid. The time used in physics is pretty well defined, 𝗔𝗡𝗗_𝗨𝗦𝗘𝗗, by
>>> consent. You
>>
>> I'm not quite certain, what you are trying to say.
>> In physics time is a quantity and measured in seconds. But that does not
>> say very much about how long a second is and why time exists in the
>> first place.
>
> 𝗶𝘁'𝘀_𝗡𝗢𝗧 a quantity, me frendo, but a fundamental dimension of the world.
I always distinguish between a quantity and the measurement of this 
quantity.

E.g.

'length' is a (physical) quantity and is measured in meters.

The meter is therefore not a quantity, but a measure (acutally a 'unit 
of measurement').

The term 'dimension' enters into the picture through mathematics.

https://en.wikipedia.org/wiki/Dimension_(physics)

"In engineering and science, dimensional analysis is the analysis of the 
relationships between different physical quantities by identifying their 
base quantities (such as length, mass, time, and electric current) and 
units of measurement (such as metres and grams) and tracking these 
dimensions as calculations or comparisons are performed. "

It is here not advised to confuse the different uses of the term 
'dimension'. E.g. Euclidean space has three dimensions and spacetime 
four. But these dimensions are not the same.

TH


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