quantity
Let an agent identify and handle quantities correctly, explain quantity types and units, and support measurement, calculation and comparison.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent identify and handle quantities correctly, explain quantity types and units, and support measurement, calculation and comparison.
A property of a thing that can be measured, counted or compared, expressed as a number with or without a unit, such as length, mass, temperature, count or amount of money; quantities are the subject of measurement science, distinguished as base or derived, scalar or vector, and extensive or intensive.
What it is for: Measurement and quantitative reasoning.
It can be identify a quantity and its unit; classify quantities; convert and compare quantities; explain measurement concepts.
Distinguishing features
Measurable
Number and unit
Typed by nature
Foundation of science
What it looks like
Not physical; numbers with units.
How it is recognised
Measurable property
Number and unit
A quality is not measurable on a numeric scale
Related models
is a kind of - category
is a kind of - category
includes - kind
is related to - specific amounts
In practice
Families and kinds
base and derived quantities
scalar and vector quantities
extensive and intensive quantities
counts and dimensionless quantities
monetary quantities
Standards and regulation
International System of Quantities and ISO 80000
SI units
Metrology vocabulary (VIM)
Failure modes and hazards
Unit errors
Confusing quantity with unit
Adding incompatible quantities
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.quantity
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What quantity.
Quantity and unit.
Which
Identifying the quantity.
Which
Identification.
- Which quantity is being measured or discussed, and what is its unit and dimension? definition
- Is it a base or derived quantity? definition
Type
Classification.
Type
Classification.
- Is the quantity scalar or vector, extensive or intensive? definition
- Why does the distinction matter here? definition
Measure Measurement.
Uncertainty.
Method
How measured.
Method
Method.
- How is this quantity measured, and with what instruments? provenance
- What is the measurement uncertainty? measurement
Standards
Quantity standards.
Standards
Standards.
- How do ISO 80000 and the SI define this quantity and its unit? provenance
- Which symbol should be used? provenance
Compute Working with quantities.
Dimensional consistency.
Operations
Combining quantities.
Operations
Operations.
- Can these quantities be added or compared, and are the units compatible? boundary
- What is the result with correct units? measurement
Convert
Conversion.
Convert
Conversion.
- How does this quantity convert between unit systems? measurement
- Is the conversion exact? boundary
Teach Concepts.
Quantity versus number.
Concepts
Quantity concepts.
Concepts
Concepts.
- How do quantity, value, number and unit relate? definition
- Which misconceptions arise? provenance
Senses
Other senses.
Senses
Other senses.
- Is quantity meant as an amount of goods, a logical quantifier or a mathematical concept? boundary
- Which entry fits? action
What the second pass must settle
- Should each quantity type be a separate entry?
- How should ISO 80000 be linked?
- How should measurement uncertainty be recorded?