Definition

Noun: 1. A fundamental law of physics: The principle stating that the total energy within an isolated system remains constant over time. Energy cannot be created or destroyed; it can only be transformed from one form to another (e.g., from kinetic to potential energy) or transferred between objects.

Usage

This term is used primarily in scientific contexts, especially in physics and engineering, to describe a universal constraint on physical processes. - It is often stated as "the law of conservation of energy." - It is a foundational concept for analyzing mechanical systems, thermodynamics, and chemical reactions.

Examples

• The design of this engine relies on the conservation of energy to calculate its maximum efficiency.
• In a perfectly insulated thermos, the conservation of energy means the coffee's heat energy stays within the system.
• The physicist explained how a pendulum demonstrates the conservation of energy as it swings.

Advanced Usage

• First Law of Thermodynamics: This is a more general formulation of the conservation of energy principle that includes heat transfer and work done on a system. It states that the change in a system's internal energy is equal to the heat added to the system minus the work done by the system.

Variants and Related Words

• Energy conservation (noun phrase): This phrase can be synonymous with "conservation of energy" in physics. However, in everyday language, it more commonly refers to the practice of reducing energy consumption (e.g., "The company's new policy focuses on energy conservation").
• Conserve (verb): To protect something from harm, loss, or change. In physics, energy is . In environmental science, we natural resources.

Synonyms

• First law of thermodynamics (in a specific context).
• Law of energy conservation.

Related Idioms or Phrases

• (To) Account for all the energy: This phrase is used when applying the principle, meaning to ensure all energy transformations in a process are identified and measured.
  • Example: "In your experiment report, you must account for all the energy; the missing 5% likely became heat due to friction."

Noun

1. the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes