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Path: ...!weretis.net!feeder8.news.weretis.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail 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 Lines: 41 Message-ID: <l622k3Fo2v8U1@mid.individual.net> References: <1HWE6H1jV8YTvxfaaL7fnCCcpe8@jntp> <uriu05$3kjja$1@paganini.bofh.team> <l45ek0Fe0s6U1@mid.individual.net> <urobnk$3v1g$1@dont-email.me> <l4ak2fF7mb7U1@mid.individual.net> <abd1af5f6c6e172db813996bbc8a1fbd@www.novabbs.com> <l4pd6iFh9qrU1@mid.individual.net> <17ba17198d38202d$39429$138080$c2565adb@news.newsdemon.com> <65E8186D.2220@ix.netcom.com> <65E81BB3.3B9B@ix.netcom.com> <65E81EFB.3C55@ix.netcom.com> <l4qmlfFn6jmU1@mid.individual.net> <17ba368e6628ddbc$38447$141478$c2265aab@news.newsdemon.com> <l4t6hpF4bo3U1@mid.individual.net> <17ba8285aef2897a$523$155296$c2565adb@news.newsdemon.com> <l4vv9tFhbj7U1@mid.individual.net> <17babf055ed1f074$1$167876$c2065a8b@news.newsdemon.com> <l52gkhFt900U1@mid.individual.net> <ush56g$2l8hb$2@paganini.bofh.team> <l55672Fb91iU1@mid.individual.net> <usjpfv$2u0sd$1@paganini.bofh.team> <l5iaguFbkcpU1@mid.individual.net> <ut1arp$9qp5$1@paganini.bofh.team> <l5nid3F5fapU1@mid.individual.net> <ut6bpl$qttp$1@paganini.bofh.team> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: individual.net bimnoZNu4+mjTtXbUCT+CgyX/dTGE19H5jC2oH/Ya5N7gb3eVA Cancel-Lock: sha1:WmpMf5m6k9z/dz3Wk2sdX6bVLxI= sha256:8U0lk1KygCY+XU9SCVZLp3HPliRJH3/dyFglaWjFyfU= User-Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 In-Reply-To: <ut6bpl$qttp$1@paganini.bofh.team> Bytes: 3319 Am 17.03.2024 um 10:05 schrieb Chellos Leontarakis: > Thomas Heger wrote: > >>> not in physics, my friend. Try π£ππ¬_πππ, ππππππ‘ππ etc, but that's >>> stupid. The time used in physics is pretty well defined, ππ‘π_π¨π¦ππ, 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. > > πΆπ'π_π‘π’π§ 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 ....