electrical conductivity
Let an agent explain electrical conductivity, relay definitions, units, measurement and values from physics and measurement sources, describe scalar, tensor and electrolytic forms, and distinguish conductivity from conductance, resistivity, thermal conductivity and superconductivity.
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 explain electrical conductivity, relay definitions, units, measurement and values from physics and measurement sources, describe scalar, tensor and electrolytic forms, and distinguish conductivity from conductance, resistivity, thermal conductivity and superconductivity.
A material property measuring how easily electric current flows through a substance, the reciprocal of resistivity, measured in siemens per metre, expressed as a scalar in isotropic materials and as a conductivity tensor in anisotropic ones, and as electrolytic conductivity for solutions carrying current by ions, widely used to measure water purity and salinity; conductivity varies enormously from insulators to metals and superconductors.
What it is for: Characterising how materials conduct electricity.
It can be explain the property; relay units and measurement; describe forms; distinguish related quantities.
Distinguishing features
Material property
Reciprocal of resistivity
Huge range
Scalar or tensor
What it looks like
Not a visible object; a material constant.
Physical character
SI unit: siemens per metre note
copper: about 5.96 x 10^7 S/m - at 20 C
seawater: about 5 S/m
pure water: about 5.5 x 10^-6 S/m
How it is recognised
Ability of a material to conduct current
Conductivity scalar, conductivity tensor, electrolytic conductivity
Conductance depends on shape; resistivity is the reciprocal; thermal conductivity concerns heat; superconductivity is zero resistance
Related models
is a kind of - in registry terms
is the reciprocal of -
is contrasted with -
is used in - measurement
In practice
Families and kinds
metallic conductivity
semiconductor conductivity
ionic and electrolytic conductivity
anisotropic conductivity tensors
superconductivity as limiting case
Standards and regulation
SI units and IEC standards
ISO 7888 water conductivity measurement
Failure modes and hazards
Confusing conductivity with conductance
Temperature effects on measurements
Confusing electrical and thermal conductivity
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What electrical conductivity is.
Science.
Definition
Definition.
Definition
Definition.
- What is electrical conductivity, and how does it differ from conductance, resistivity, thermal conductivity and superconductivity? definition
- Is the question about physics, materials, water measurement or electronics? boundary
Forms
Forms.
Forms
Forms.
- What are the scalar, tensor and electrolytic forms? definition
- Which entry fits the specific form? action
Physics Physics.
Science.
Mechanisms
Mechanisms.
Mechanisms
Mechanisms.
- How do electrons, holes and ions carry current in different materials? provenance
- Which references are standard? provenance
Temperature
Temperature dependence.
Temperature
Temperature.
- How does conductivity change with temperature in metals and semiconductors? provenance
- Which sources are cited? provenance
Measurement Measurement.
Application.
Methods
Methods.
Methods
Methods.
- How is conductivity measured with four-point probes and conductivity cells? provenance
- Which entry fits four-terminal sensing? action
Water
Water quality.
Water
Water.
- How is conductivity used to assess water purity and salinity? provenance
- Which entry fits salinity? action
Context Values and history.
Context.
Values
Typical values.
Values
Values.
- What are typical conductivities of metals, semiconductors, electrolytes and insulators? provenance
- Which entry fits the specific material? action
History
History.
History
History.
- How did Ohm and others develop the concept? provenance
- Which entry fits Ohm s law? action
What the second pass must settle
- Should electrolytic conductivity be a separate primary entry?
- How should physics sources be linked?
- How should the tensor form be recorded?