mass
Let an agent handle mass by measurement, units, uncertainty and context, including body weight, respectfully and without health judgements.
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 handle mass by measurement, units, uncertainty and context, including body weight, respectfully and without health judgements.
A property of a physical body measuring its amount of matter and its resistance to acceleration; the SI unit is the kilogram. In everyday use it is often called weight, as in body weight.
What it is for: Quantifying matter in science, trade, medicine and engineering.
It can be weigh on calibrated scales; convert units; state uncertainty; track body weight with professional guidance.
Distinguishing features
Amount of matter and inertia
Differs from weight as force
Additive quantity
Legal metrology for trade
What it looks like
Not visible; measured with balances and scales.
Physical character
SI unit: kilogram kg - defined via the Planck constant since 2019
How it is recognised
Values in kg, g, lb
Scale readings
Weight as force in newtons is a different quantity
Related models
is a kind of - category
is measured in - unit
is confused with - force
relates to - quantities
In practice
Families and kinds
inertial and gravitational mass
rest mass
body mass
birth mass
mass in trade
Identifiers
SI base quantity M dimension symbol
Standards and regulation
SI Brochure
OIML R 76 non-automatic weighing instruments
EU Measuring Instruments Directive
Failure modes and hazards
Confusing mass and weight
Uncalibrated scales
Stigmatising body weight
Also called
+30
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.mass-group
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Measurement Weighing.
Weighing needs calibration.
Value
Result.
Value
Mass value.
- What is the mass, in which unit? measurement
- What is the uncertainty? measurement
Instrument
Scale.
Instrument
Instrument.
- Which scale was used, and is it calibrated? provenance
- Is it legal for trade? boundary
Physics Concept.
Mass differs from weight.
Concept
Inertia.
Concept
Concept.
- Is mass or weight as force meant? boundary
- How are they related? definition
Units
Conversion.
Units
Units.
- How does this convert between kg and lb? measurement
- Is precision preserved? boundary
Body mass Health context.
Body weight is personal.
Health
Guidance.
Health
Health guidance.
- Is professional guidance needed to interpret this weight? boundary
- Is judgement avoided? boundary
Infants
Birth weight.
Infants
Birth and infant weight.
- How is infant weight tracked against growth charts? definition
- Who advises parents? action
Trade Legal metrology.
Trade weights are regulated.
Rules
Measuring instruments.
Rules
Metrology rules.
- Which rules apply to weighing for sale? provenance
- Is the instrument verified? provenance
Labels
Net quantity.
Labels
Net quantity.
- Is the declared net mass accurate? boundary
- What tolerance applies? measurement
What the second pass must settle
- Should body mass be a separate entry?
- How should mass and weight be linked?
- How should health contexts be routed?