conservation of energy: meaning, definition, pronunciation and examples
mediumacademic, technical, environmental
Quick answer
What does “conservation of energy” mean?
The fundamental scientific law that states that the total energy in a closed system remains constant.
Audio
Pronunciation
Definition
Meaning and Definition
The fundamental scientific law that states that the total energy in a closed system remains constant; energy can be transformed from one form to another but cannot be created or destroyed.
In a broader sense, the principle of using energy resources efficiently and responsibly to minimise waste and protect the environment.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. UK English more commonly uses 'energy conservation' for the practical application.
Connotations
In both varieties, the primary connotation is scientific. In public discourse, it carries strong environmental and economic connotations.
Frequency
Frequency is similar in technical/scientific registers. The shortened form 'energy conservation' is slightly more frequent in general US usage.
Grammar
How to Use “conservation of energy” in a Sentence
The [noun] illustrates conservation of energy.According to conservation of energy, [clause].[Subject] is a result of conservation of energy.Vocabulary
Collocations
Examples
Examples of “conservation of energy” in a Sentence
verb
British English
- The system conserves energy efficiently.
- We must all strive to conserve energy.
American English
- The design conserves energy effectively.
- Homeowners are encouraged to conserve energy.
adverb
British English
- The device works energy-conservingly.
- They designed the process very energy-consciously.
American English
- The motor runs more energy-efficiently.
- The policy was implemented energy-responsibly.
adjective
British English
- The energy-conserving features of the building are impressive.
- An energy-conservation measure was introduced.
American English
- The energy-conserving measures saved money.
- We need energy-conservation legislation.
Usage
Meaning in Context
Business
Refers to cost-saving measures through reduced energy consumption in operations.
Academic
A foundational law in physics and engineering; a topic in environmental science.
Everyday
Discussed in the context of reducing electricity bills and being environmentally friendly.
Technical
A non-negotiable law in physical calculations and system design.
Vocabulary
Synonyms of “conservation of energy”
Strong
Neutral
Weak
Vocabulary
Antonyms of “conservation of energy”
Watch out
Common Mistakes When Using “conservation of energy”
- Using a plural verb: 'The conservation of energy are...' (incorrect). It is singular.
- Confusing 'conservation' with 'conversation'.
- Incorrectly stating energy can be 'recycled' or 'reused' in the strict physics sense; it is transformed.
FAQ
Frequently Asked Questions
Not exactly. 'Conservation of energy' is the scientific law. 'Energy efficiency' is a related practical measure of how well energy is used, often discussed under the broader topic of 'energy conservation' (the practice).
No. Within the domain of classical physics, it is considered an absolute, universal law. No experiment has ever shown a violation. In modern cosmology, the total energy of the universe is a complex topic, but the law holds in all local, well-defined systems.
It is a powerful tool for analysis and design. By applying this law, engineers can balance energy inputs and outputs in systems (like engines or electrical grids) to calculate efficiency, predict performance, and ensure designs are physically possible.
Practically, it encourages actions like insulating homes, using efficient appliances, and turning off unused devices to reduce wasted energy (often as heat), which saves money and reduces environmental impact. Scientifically, it explains why perpetual motion machines are impossible.
The fundamental scientific law that states that the total energy in a closed system remains constant.
Conservation of energy is usually academic, technical, environmental in register.
Conservation of energy: in British English it is pronounced /ˌkɒnsəˈveɪʃən əv ˈɛnədʒi/, and in American English it is pronounced /ˌkɑːnsɚˈveɪʃən əv ˈɛnɚdʒi/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “It's a simple case of conservation of energy. (used to explain a situation)”
Learning
Memory Aids
Mnemonic
Think of energy like money in a sealed bank vault: you can move it between accounts (change its form), but the total amount inside never changes unless the vault is opened (system is not closed).
Conceptual Metaphor
ENERGY IS A CONSERVED SUBSTANCE / ENERGY IS A VALUABLE RESOURCE TO BE GUARDED.
Practice
Quiz
In which context is 'conservation of energy' used most precisely?