Difference between revisions of "Entity"

Latest revision as of 11:11, 24 December 2021

high-resolution terminology - matching measurements at high-resolution

Entity

Description

An entity of type X is something that can measured as an extensive quantity or counted as an elementary entity. The term entity with symbol X, therefore, has a general meaning, including but not limited to elementary entities U_X. The distinction can be emphasized by using the term entity-type X, to avoid confusion of an entity X with the more restricted definition of elementary entity U_X as a single countable object or event.

Abbreviation: X

Reference: BEC2020.1 doi10.26124bec2020-0001.v1

Communicated by Gnaiger Erich (2020-05-20) last update 2020-07-11
in: Anastrophe XX Entity X and elementary unit x of X-mass Carol

References

Bioblast link	Reference	Year
Gnaiger 2020 BEC MitoPathways	Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5^th ed. Bioenerg Commun 2020.2. https://doi.org/10.26124/bec:2020-0002	2020
Gnaiger 2020 MitoFit x	Gnaiger E (2021) The elementary unit — canonical reviewer's comments on: Bureau International des Poids et Mesures (2019) The International System of Units (SI) 9th ed. https://doi.org/10.26124/mitofit:200004.v2	2021
BEC 2020.1 doi10.26124bec2020-0001.v1	Gnaiger E et al ― MitoEAGLE Task Group (2020) Mitochondrial physiology. Bioenerg Commun 2020.1. https://doi.org/10.26124/bec:2020-0001.v1	2020

MitoPedia concepts: Ergodynamics

@@ Line 1: / Line 1: @@
 {{MitoPedia
-|abbr=''U''<sub>''X''</sub> [x]
+|abbr=''X''
-|description=A '''unit-entity''' ''U''<sub>''X''</sub> [x] of elementary type ''X'' is a ''single'' countable object (''X'' = molecules, cells, organisms, particles, parties) or a single countable event (''X'' = beats, collisions, emissions, decays, celestial cycles, parties). "An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles" ([[Bureau International des Poids et Mesures 2019 The International System of Units (SI) |Bureau International des Poids et Mesures 2019)]].
+|description=An '''entity''' of type ''X'' is something that can measured as an [[extensive quantity]] or counted as an [[elementary entity]]. The term entity with symbol ''X'', therefore, has a general meaning, including but not limited to elementary entities ''U''<sub>''X''</sub>. The distinction can be emphasized by using the term entity-type ''X'', to avoid confusion of an entity ''X'' with the more restricted definition of elementary entity ''U''<sub>''X''</sub> as a ''single'' countable object or event.
-If an object is defined as a group of particles (a party of two), then the entity is the single group but not the particle. A number of defined unit entities ''U''<sub>''X''</sub> is a [[count]], ''N''<sub>''X''</sub> = ''N''·''U''<sub>''X''</sub> [x], where ''N'' is only a number and as such ''N'' is dimensionless. The unit entity ''U''<sub>''X''</sub> has the [[dimension]] U of the [[count]] ''N''<sub>''X''</sub>. The unit entity ''U''<sub>''X''</sub> has the same unit [x] as the count ''N''<sub>''X''</sub>, or more accurately it gives the count the defining 'counting unit' [x]. From the definition of count as the number (''N'') of unit entities (''U'') of elementary type ''X'', it follows that count divided by unit entity is simply a number, ''N'' = ''N''<sub>''X''</sub>·''U''<sub>''X''</sub><sup>-1</sup>. The elementary entity type (''X'' = electrons, ions, molecules, cells, organisms, events) defines the identity ''X'' of the unit entity ''U''<sub>''X''</sub>. Since a count ''N''<sub>''X''</sub> is the number of unit entities, the unit entity ''U''<sub>''X''</sub> is not a count (''U''<sub>''X''</sub> is not identical with ''N''·''U''<sub>''X''</sub>).
 |info=[[BEC2020.1 doi10.26124bec2020-0001.v1]]
 }}
 __TOC__
-  Communicated by [[Gnaiger Erich]] (2020-05-20) last update 2020-06-11
+  Communicated by [[Gnaiger Erich]] (2020-05-20) last update 2020-07-11
-== Entity-type and unit-entity ==
+ in: Anastrophe ''XX'' [[X-mass Carol#Anastrophe_XX:_Entity_X_and_elementary_unit_x |'''Entity ''X'' and elementary unit x''']] of '''''X''-mass Carol'''
-:::: Entity-type ''X'' is distinguished from unit-entity ''U''<sub>''N''<sub>''X''</sub></sub>. Dual-message code may lead to misunderstanding depending on context. For example, ''X'' = ce in 'cell mass' is normally understood as meaning "the mass of all entities of entity-type ce in a sample", ''m''<sub>ce</sub> [kg]. In contrast, ''X'' = <span style="color:red">body</span> in the context of [[body mass]] and body mass index (BMI) is used in dual-message code, ''m''<sub><span style="color:red">body</span></sub>. <span style="color:red">Body</span> mass with dual-message code means the mass of all entities of entity-type human body, ''m''<sub>body</sub> [kg], divided by the number of bodies, ''N''<sub>body</sub>, which leads to the explicit canonical expression ''M''<sub>''U''<sub>body</sub></sub> = ''m''<sub>body</sub>·''N''<sub>body</sub><sup>-1</sup>.
-::::* Colour code: Colour <span style="color:red">red</span>  may be used in <span style="color:red">''X''</span>, indicating that the term <span style="color:red">entity</span> or symbol <span style="color:red">''X''</span> are used in dual-message code, meaning both entity-type and unit-entity. When specifying "single entity ''X''" it is sufficiently clear that ''X'' is used in dual-message mode, and the term "number of ''X''" is equally clear to meaning "number of unit-entities ''X''", ''N''<sub>''X''</sub> = ''N''·''U''<sub>''N''<sub>X</sub></sub><sup>-1</sup>. Similarly, in the term "O<sub>2</sub> flow per <span style="color:red">cell</span>" ''I''<sub>O<sub>2</sub>/<span style="color:red">ce</span></sub>" it is sufficiently clear that <span style="color:red">ce</span> is used in in dual-message code.
-== Base quantities and count ==
-::::{{Template:Base quantities and count}}
 == References ==
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 |order=ascending
 }}
-{{Keywords: SI base units}}
 {{MitoPedia concepts
 |mitopedia concept=Ergodynamics
 }}