permeability
C1Formal / Technical
Definition
Meaning
The quality or state of allowing liquids, gases, or other substances to pass through; the degree to which a material has pores or openings that permit flow.
In a more abstract sense, the capacity for ideas, influences, or cultural elements to spread and be accepted within a system, group, or society.
Linguistics
Semantic Notes
Primarily a property of materials in physical contexts (e.g., soil, membranes). In extended use, it often describes the openness of systems (e.g., political borders, academic disciplines) to external influences.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or usage differences. Both use the term identically in technical and general contexts.
Connotations
Neutral in both, though slightly more common in UK English in geology/hydrology contexts.
Frequency
Comparably low frequency in general use; higher in scientific, engineering, and academic texts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
Permeability of [material] to [substance]The permeability of [system] to [influence]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms directly use 'permeability'.]”
Usage
Context Usage
Business
Rarely used; might appear in contexts like 'market permeability' to describe ease of entry for new products.
Academic
Common in science and engineering papers (e.g., geology, biology, materials science). Also used in social sciences (e.g., 'cultural permeability').
Everyday
Very rare; unlikely in casual conversation.
Technical
Core term in hydrology, civil engineering, physics (electromagnetism), and biology (cell membranes).
Examples
By Part of Speech
verb
British English
- Water permeates the soil.
- New ideas began to permeate the organisation.
American English
- The dye permeated the fabric.
- A sense of excitement permeated the crowd.
adverb
British English
- The substance diffused permeably through the layer.
American English
- The coating allows water vapour to pass permeably.
adjective
British English
- The rock is highly permeable.
- A permeable membrane is essential for the process.
American English
- The jacket is waterproof but permeable to sweat vapour.
- They advocated for more permeable borders.
Examples
By CEFR Level
- Sand has high water permeability.
- This material has low air permeability.
- The engineer tested the soil's permeability before construction.
- The permeability of the cell wall regulates what enters the cell.
- The study quantified the relative permeability of the sandstone to various hydrocarbons.
- Critics pointed to the cultural permeability of national borders in the digital age.
Learning
Memory Aids
Mnemonic
Think of a PERMEable membrANE – its ABILITY to let things through is its permeability.
Conceptual Metaphor
A BOUNDARY AS A FILTER or a WALL AS A SIEVE (allowing some things through while blocking others).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque from 'проницаемость', which is broader and can mean 'insightfulness' (of a person). 'Permeability' is strictly about physical or systemic passage.
- Do not confuse with 'проходимость' (passability, e.g., of a road), which is different.
Common Mistakes
- Using 'permeability' to describe a person's understanding (use 'perceptiveness').
- Confusing 'permeability' with 'porosity' (porosity is about the volume of voids, permeability is about the connectedness and ability to transmit fluid).
- Misspelling as 'permability'.
Practice
Quiz
In which context is the term 'permeability' LEAST likely to be used?
FAQ
Frequently Asked Questions
No. Porosity measures the volume of empty spaces in a material. Permeability measures how easily a fluid can flow through those connected spaces. A material can be porous but not permeable if the pores are not interconnected.
Yes, in a metaphorical or extended sense. For example, 'the permeability of academic disciplines' refers to how open they are to ideas from other fields.
'Impermeability' is the direct antonym. In engineering, a 'low-permeability' or 'impermeable' layer (like clay) is often called an 'aquitard' or barrier.
In physics, 'magnetic permeability' is a specific property of a material that quantifies its ability to support the formation of a magnetic field within itself, analogous to but distinct from fluid permeability.