fluid
Let an agent explain fluids, relay properties, classifications and governing equations from physics and engineering sources, and distinguish fluids from solids, liquids alone, bodily fluids as a biological category and the colloquial sense of fluid as flexible.
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 fluids, relay properties, classifications and governing equations from physics and engineering sources, and distinguish fluids from solids, liquids alone, bodily fluids as a biological category and the colloquial sense of fluid as flexible.
A substance that continuously deforms, or flows, under an applied shear stress, including liquids, gases and plasmas, characterised by properties such as density, pressure and viscosity, and classified as Newtonian fluids, such as water and air, whose viscosity is independent of shear rate, or non-Newtonian fluids, such as blood, ketchup and cornstarch suspensions; fluids are studied in fluid mechanics, and supercritical fluids combine properties of liquids and gases.
What it is for: Not applicable; a state-based category of matter.
It can be explain properties; relay classifications; describe governing equations; distinguish related concepts.
Distinguishing features
Flows under shear
No fixed shape
Viscosity
Continuum description
What it looks like
Liquids that take the shape of their container, gases that fill it, and flowing materials.
Physical character
water dynamic viscosity at 20 C: about 1.0 mPa s
air density at sea level: about 1.225 kg/m3 - 15 C
governing equations: Navier-Stokes equations note
How it is recognised
Substance that flows under shear stress
Fluid, liquid, gas, plasma, supercritical fluid
Solids resist shear elastically; liquids are one kind of fluid; bodily fluids are biological; fluid also means flexible colloquially
Related models
is a kind of - in registry terms
is studied in -
includes -
is contrasted with -
In practice
Families and kinds
liquids
gases
plasmas
Newtonian fluids
non-Newtonian fluids
supercritical fluids
superfluids
Standards and regulation
ISO viscosity measurement standards
Hydraulic fluid specifications
Failure modes and hazards
Confusing liquids and fluids
Misapplying Newtonian models to complex fluids
Ambiguity with bodily fluids
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.fluid-substance
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 a fluid is.
Science.
Definition
Definition.
Definition
Definition.
- What is a fluid, and how does it differ from solids, liquids alone, bodily fluids and the everyday sense of fluid? definition
- Is the question about physics, engineering, cooking or biology? boundary
Kinds
Kinds.
Kinds
Kinds.
- How do liquids, gases, plasmas and supercritical fluids differ? definition
- Which entry fits the specific kind? action
Properties Properties.
Science.
Viscosity
Viscosity.
Viscosity
Viscosity.
- What is viscosity, and how do Newtonian and non-Newtonian fluids differ? provenance
- Which references are standard? provenance
Pressure
Pressure and buoyancy.
Pressure
Pressure.
- How do pressure, Pascal s principle and buoyancy work in fluids? provenance
- Which sources are cited? provenance
Mechanics Fluid mechanics.
Application.
Equations
Governing equations.
Equations
Equations.
- What do the Navier-Stokes and Euler equations describe? provenance
- Which entry fits Navier-Stokes equations? action
Flow
Laminar and turbulent flow.
Flow
Flow.
- How does the Reynolds number predict turbulence? provenance
- Which entry fits Reynolds number? action
Context Everyday and exotic fluids.
Context.
Everyday
Non-Newtonian examples.
Everyday
Everyday.
- Why do ketchup and cornstarch mixtures behave strangely? provenance
- Which entry fits non-Newtonian fluid? action
Superfluids
Superfluids.
Superfluids
Superfluids.
- What is superfluid helium? provenance
- Which entry fits superfluidity? action
What the second pass must settle
- Should non-Newtonian fluid be a separate entry?
- How should fluid mechanics sources be linked?
- Should the everyday sense be disambiguated?