Definition

1. Noun:
   • A fundamental postulate of thermodynamics: The "zeroth law of thermodynamics" is a foundational principle stating that if two thermodynamic systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. This law establishes the transitive property of thermal equilibrium and justifies the concept and measurement of temperature.

Usage

• The zeroth law of thermodynamics is considered the basis for temperature measurement because it allows for the use of a thermometer as a "third system."
• Before the other laws were named, scientists realized this logical principle was so fundamental it needed to be stated first, hence it was designated the zeroth law of thermodynamics.

Examples

• Noun:
  • The zeroth law of thermodynamics provides the logical foundation that makes thermometers possible.
  • If object A and object C are at the same temperature, and object B and object C are at the same temperature, then the zeroth law of thermodynamics tells us that object A and object B are also at the same temperature.

Advanced Usage

• "To satisfy the zeroth law of thermodynamics": To meet the condition defined by this principle.
  • For a thermometer to function correctly, the entire measurement process must satisfy the zeroth law of thermodynamics.

Variants and Related Words

• Zeroth Law (n): A common abbreviated form of "zeroth law of thermodynamics."
  • The Zeroth Law is often introduced before the first and second laws in physics courses.
• Thermal Equilibrium (n): The state where two systems have no net heat flow between them, a key concept in the law's statement.
• Thermodynamics (n): The branch of physical science concerned with heat, temperature, and their relation to energy and work.

Synonyms

• There are no direct single-word synonyms for this specific scientific law. It can be paraphrased as "the principle of transitive thermal equilibrium."

Related Concepts (Analogous to Idioms/Phrasal Verbs)

• Transitivity of thermal equilibrium: A descriptive phrase for the core concept of the zeroth law.
  • The transitivity of thermal equilibrium is a necessary condition for defining a temperature scale.

Noun

1. the law that if two bodies are in thermal equilibrium with a third body then the first two bodies are in thermal equilibrium with each other