closed system: meaning, definition, pronunciation and examples
C1Technical / Formal
Quick answer
What does “closed system” mean?
A system that does not exchange matter with its surroundings.
Audio
Pronunciation
Definition
Meaning and Definition
A system that does not exchange matter with its surroundings.
Any system that is self-contained, isolated, or operates without external influence or input; often implies restricted or limited interaction.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling and syntactic preferences follow regional norms (e.g., 'behaviour' vs. 'behavior' in surrounding text).
Connotations
Generally neutral in scientific contexts; can carry negative connotations (rigid, insular) in social or business contexts.
Frequency
Equally common in academic and technical registers in both varieties.
Grammar
How to Use “closed system” in a Sentence
[adjective] + closed systemclosed system + [prepositional phrase: of/in/for]Vocabulary
Collocations
Examples
Examples of “closed system” in a Sentence
verb
British English
- The experiment was designed to close the system to atmospheric pressure.
- They are closing the system to external inputs.
American English
- The reactor closes the system to prevent contamination.
- We need to close the system before initiating the cycle.
adverb
British English
- The apparatus operates closed-system.
- It functions nearly closed-system.
American English
- The reactor runs closed-system for safety.
- It was designed to work completely closed-system.
adjective
British English
- We studied a closed-system thermodynamic model.
- They have a rather closed-system approach to management.
American English
- It's a closed-system design for water recycling.
- The software functions as a closed-system environment.
Usage
Meaning in Context
Business
Describes a company culture resistant to new ideas or market feedback.
Academic
Core concept in thermodynamics (physics), systems theory, and phonology (linguistics).
Everyday
Rare. Might describe a family or group that doesn't interact with outsiders.
Technical
Precise term for a system with no mass transfer across its boundary.
Vocabulary
Synonyms of “closed system”
Strong
Neutral
Weak
Vocabulary
Antonyms of “closed system”
Watch out
Common Mistakes When Using “closed system”
- Confusing 'closed system' (no matter exchange) with 'isolated system' (no energy OR matter exchange).
- Using it as a synonym for 'secretive' without the systemic implication.
FAQ
Frequently Asked Questions
No. In thermodynamics, a closed system exchanges energy but not matter with its surroundings. An isolated system exchanges neither energy nor matter.
Yes, in technical contexts (e.g., 'a closed system is essential for this experiment'). In social contexts, it often has a negative connotation (insular, resistant to change).
A sealed, unopened water bottle is a good approximation—the water (matter) cannot get in or out, though heat (energy) can still transfer.
A closed-system organisation does not adapt to external market or social changes. An open-system organisation actively seeks and incorporates external feedback and innovation.
A system that does not exchange matter with its surroundings.
Closed system is usually technical / formal in register.
Closed system: in British English it is pronounced /ˌkləʊzd ˈsɪstəm/, and in American English it is pronounced /ˌkloʊzd ˈsɪstəm/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “A closed system of thought”
- “Operating in a closed system”
Learning
Memory Aids
Mnemonic
Think of a sealed terrarium jar: the plants and air inside are a CLOSED SYSTEM—nothing gets in or out.
Conceptual Metaphor
SYSTEMS ARE CONTAINERS (a closed system is a sealed container).
Practice
Quiz
In which field is 'closed system' a fundamental technical term?