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Thermodynamics

ther-moh-dy-NAM-iks /ˌθɜːrmoʊdaɪˈnæmɪks/

nounC2GRE

technicalacademic

The branch of physical science that deals with the relations between heat and other forms of energy and work.

Thermodynamics is governed by four laws that describe how energy is transferred and transformed in physical systems, particularly concerning heat, temperature, and entropy. It's a macroscopic theory, dealing with bulk properties rather than individual particles.

The story behind the word. The word 'Thermodynamics' is a beautiful blend of Greek roots. 'Thermo-' comes from 'therme', meaning 'heat', and '-dynamics' comes from 'dynamis', meaning 'power' or 'force'. So, literally, it's the 'power of heat' or 'heat in motion'. This term was coined in the mid-19th century as scientists began to systematically study the relationship between heat, work, and energy, particularly in the context of steam engines.

Word relationships

heat physics: A more general, less formal term for the study of heat, whereas thermodynamics is a specific, rigorous branch.

Commonly confused with

Quantum Mechanics: Thermodynamics deals with macroscopic systems and energy transfer; Quantum Mechanics deals with the behavior of matter and energy at the atomic and subatomic levels.

Word family

thermodynamic (adjective): relating to thermodynamics

Collocations

laws of thermodynamics
statistical thermodynamics
chemical thermodynamics
thermodynamic system

Example sentences

"The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed." In a university lecture.
"Engineers apply principles of thermodynamics to design more efficient engines, refrigerators, and power plants." Discussing engineering principles.
"The second law of thermodynamics, which describes the increase of entropy, suggests a direction for time and the eventual 'heat death' of the universe." In a philosophical discussion about the universe.

Memory hook

Remember 'THERMO' for heat (like a thermometer) and 'DYNAMICS' for power or change (like a dynamic person). It's the study of heat's power. Heat & Energy

When not to use

This is a highly technical term. Do not use it in casual conversation unless you are speaking to someone with a strong scientific background and the context is appropriate.

Fun facts

The concept of entropy, a measure of disorder, is central to thermodynamics.
Rudolf Clausius, William Thomson (Lord Kelvin), and Sadi Carnot were pioneers in the field of thermodynamics.

Related words

Energy, Quantum, Relativity

Explore more words

ecology, hydrology, methodology, geothermal, Calculus, determinism

Also appears in

Physical Sciences & Cosmology → Thermodynamics & Entropy