熱力学

• Reading: ねつりきがく
• Romaji: netsurikigaku
• Kanji breakdown: 熱 (netsu/atsu-) — heat; 力 (ryoku/chikara) — force, power; 学 (gaku) — study, science
• Pronunciation: /ne.tsɯ.ɾi.ki.ɡa.kɯ/

Meaning

Thermodynamics; the branch of physics that deals with the relationships between heat, work, temperature, and energy, and the laws governing their transformations.

A noun describing a foundational branch of physics and chemistry. The four laws of thermodynamics (第零〜第三法則) govern everything from engine efficiency to biological energy metabolism. Key concepts include エントロピー (entropy), エンタルピー (enthalpy), and 自由エネルギー (free energy). 統計力学 (statistical mechanics) provides the microscopic foundation for thermodynamics.

Examples

1. 熱力学の第二法則によれば、孤立系のエントロピーは自発的に増大する方向に向かう。 According to the second law of thermodynamics, the entropy of an isolated system tends to increase spontaneously.
2. 熱力学の原理に基づけば、理想的な熱機関でさえカルノー効率という上限がある。 Based on the principles of thermodynamics, even an ideal heat engine has an upper limit known as Carnot efficiency.
3. 熱力学は物理化学・工学・生物学にまたがる普遍的な基礎理論を提供する。 Thermodynamics provides a universal theoretical foundation spanning physical chemistry, engineering, and biology.

Usage Guide

Context: physics, chemistry, engineering, biology, academic writing

Tone: neutral

Origin & History

Compound of 熱 (netsu — heat) and 力学 (rikigaku — mechanics, dynamics). A Meiji-era translation of the German 'Thermodynamik', first coined by Lord Kelvin.

Cultural Context

Era: Modern

Generation: Students and professionals

Social background: Technical