Cookies help us deliver our services. By using our services, you agree to our use of cookies. More information

Difference between revisions of "Unit"

From Bioblast
Β 
(8 intermediate revisions by the same user not shown)
Line 1: Line 1:
{{MitoPedia
{{MitoPedia
|abbr=''u''''Q''
|abbr=''U''<sub>''X''</sub> [x]; ''u''<sub>''Q''</sub>
|description=''unit''
|description=[[File:Count-vs-number.png|right|120px|link=Elementary entity]]
|info=[[MitoFit 2020.4]]
A '''unit''' is defined as 'a single individual thing' in Euclid's ''Elements'' (Book VII). This defines the [[elementary entity]] ''U''<sub>''X''</sub> of entity-type ''X'' (thing). The [[International System of Units]] defines the unit as 'simply a particular example of the quantity concerned which is used as a reference'. Then the ''value'' of a quantity ''Q'' is the product of a number ''N'' and a unit ''u''<sub>''Q''</sub>. The symbols ''U''<sub>''X''</sub> and ''u''<sub>''Q''</sub> are chosen here with ''U'' and ''u'' for 'unit': ''U''<sub>''X''</sub> is the Euclidean or entetic unit ('eunit'), and ''u''<sub>''Q''</sub> is the abstract unit ('aunit'). Subscripts ''X'' and ''Q'' for 'entity-type' and 'quantity-type' reflect perhaps even more clearly than words the contrasting meanings of the two fundamental definitions of an entetic versus abstract 'unit'. The term 'unit' with its dual meanings is used and confused in practical language and the scientific literature today. In the elementary entity ''U''<sub>''X''</sub>, the unit (the 'one') relates to the entity-type ''X'', to the single individual thing (single individual or undivided; the root of the word ''thing'' has the meaning of 'assembly'). The quantity involved in the unit of a single thing is the ''count'', ''N''<sub>''X''</sub> = ''N''Β·''U''<sub>''X''</sub> [x]. In contrast to counting, a unit ''u''<sub>''Q''</sub> is linked to the measurement of quantities ''Q''<sub>''u''</sub> = ''N''Β·''u''<sub>''Q''</sub>, such as volume, mass, energy; and these quantities β€” and hence the units ''u''<sub>''Q''</sub> β€” are abstracted from entity-types, pulled away from the world of real things. The new SI (2019-05-20) has completed this total abstraction of units, from the previous necessity to not only provide a quantitative definition but also a physical realization of a unit in the form of an 'artefact', such as the international prototype (IPK) for the unit kilogram. The new definitions of the base SI units are independent of any physical realization: ''u''<sub>''Q''</sub> is separate from ''X''. The classical unit of Euklid is the elementary unit for counting, entirely independent of measuring. Therefore, the quantity [[count]] is unique with respect to two properties: (''1'') in contrast to all other quantities in the metric system, the count depends on quantization of entities ''X''; and (''2'') in the SI, the '''N'''umber 1 is the '''U'''nit of the '''C'''ount of '''entities''' β€” NUCE.
Β 
|info=[[Bureau International des Poids et Mesures 2019 The International System of Units (SI)]], [[MitoFit 2020.4]]
}}
}}
Communicated by [[Gnaiger Erich]] (2020-07-06) last update 2020-08-14
in: Anastrophe ''XX'' [[X-mass Carol#Anastrophe_XX:_Entity_X_and_elementary_unit_x |'''Entity ''X'' and elementary unit x''']] of '''''X''-mass Carol'''
{{MitoPedia concepts
{{MitoPedia concepts
|mitopedia concept=Ergodynamics
|mitopedia concept=Ergodynamics
}}
}}
{{MitoPedia methods}}
{{MitoPedia O2k and high-resolution respirometry}}
{{MitoPedia topics}}

Latest revision as of 20:39, 20 September 2022


high-resolution terminology - matching measurements at high-resolution


Unit

Description

Count-vs-number.png

A unit is defined as 'a single individual thing' in Euclid's Elements (Book VII). This defines the elementary entity UX of entity-type X (thing). The International System of Units defines the unit as 'simply a particular example of the quantity concerned which is used as a reference'. Then the value of a quantity Q is the product of a number N and a unit uQ. The symbols UX and uQ are chosen here with U and u for 'unit': UX is the Euclidean or entetic unit ('eunit'), and uQ is the abstract unit ('aunit'). Subscripts X and Q for 'entity-type' and 'quantity-type' reflect perhaps even more clearly than words the contrasting meanings of the two fundamental definitions of an entetic versus abstract 'unit'. The term 'unit' with its dual meanings is used and confused in practical language and the scientific literature today. In the elementary entity UX, the unit (the 'one') relates to the entity-type X, to the single individual thing (single individual or undivided; the root of the word thing has the meaning of 'assembly'). The quantity involved in the unit of a single thing is the count, NX = NΒ·UX [x]. In contrast to counting, a unit uQ is linked to the measurement of quantities Qu = NΒ·uQ, such as volume, mass, energy; and these quantities β€” and hence the units uQ β€” are abstracted from entity-types, pulled away from the world of real things. The new SI (2019-05-20) has completed this total abstraction of units, from the previous necessity to not only provide a quantitative definition but also a physical realization of a unit in the form of an 'artefact', such as the international prototype (IPK) for the unit kilogram. The new definitions of the base SI units are independent of any physical realization: uQ is separate from X. The classical unit of Euklid is the elementary unit for counting, entirely independent of measuring. Therefore, the quantity count is unique with respect to two properties: (1) in contrast to all other quantities in the metric system, the count depends on quantization of entities X; and (2) in the SI, the Number 1 is the Unit of the Count of entities β€” NUCE.

Abbreviation: UX [x]; uQ

Reference: Bureau International des Poids et Mesures 2019 The International System of Units (SI), MitoFit 2020.4

Communicated by Gnaiger Erich (2020-07-06) last update 2020-08-14
in: Anastrophe XX Entity X and elementary unit x of X-mass Carol


MitoPedia concepts: Ergodynamics