surface tension
Let an agent handle surface tension with values, units, temperature dependence and applications.
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 surface tension with values, units, temperature dependence and applications.
The tendency of a liquid surface to contract to the smallest possible area, caused by cohesive forces between molecules, measured as force per unit length or energy per unit area.
What it is for: Explaining droplets, capillarity, bubbles and wetting, and designing detergents, inks and coatings.
It can be measure it with tensiometers; reduce it with surfactants; use it in capillary and microfluidic designs; predict droplet and bubble behaviour.
Distinguishing features
Property of liquid interfaces
Decreases with temperature
Lowered by surfactants
Governs capillary action
What it looks like
Beading droplets, floating light objects, curved menisci.
Physical character
water at 20 C: 72.8 mN/m
ethanol at 20 C: 22.3 mN/m
How it is recognised
Spherical droplets and menisci
Insects walking on water
Values in mN/m
Related models
is a kind of - material property
is lowered by - detergents
causes - phenomenon
is measured in - unit
In practice
Families and kinds
liquid-gas surface tension
interfacial tension between liquids
dynamic surface tension
Identifiers
SI unit N/m newton per metre
Standards and regulation
ISO 304 for surface tension of surfactant solutions
Failure modes and hazards
Ignoring temperature and contamination effects
Unit confusion (mN/m vs dyn/cm, which are equal)
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.surface-tension
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Value How strong.
Values need conditions.
Number
mN/m.
Value
Surface tension value.
- What is its surface tension, at what temperature? measurement
- From which source? provenance
Interface
Which phases.
Interface
Interface.
- Between which phases is it measured? definition
- Is it static or dynamic? definition
Measurement Methods.
Methods differ.
Method
Tensiometry.
Method
Method.
- Which method measured it? provenance
- How precise? measurement
Contamination
Purity.
Purity
Contamination effects.
- Could contamination have affected the value? boundary
- How was purity ensured? provenance
Effects What it causes.
Effects matter in practice.
Capillarity
Rise in tubes.
Capillarity
Capillary effects.
- How does it affect capillary rise here? measurement
- What role does wetting play? definition
Droplets and bubbles
Shapes.
Droplets
Droplet behaviour.
- How does it shape droplets or bubbles? definition
- What happens at small scales? definition
Control Changing it.
Surfactants and temperature change it.
Surfactants
Detergents.
Surfactants
Surfactant effects.
- How much do surfactants lower it? measurement
- What is the critical micelle concentration? measurement
Applications
Inks, coatings.
Applications
Applications.
- How is surface tension controlled in this product? definition
- What are the environmental effects of surfactants? boundary
What the second pass must settle
- Should interfacial tension be a separate entry?
- How should temperature dependence be recorded?
- How should measurement methods be linked?