Best Thermodynamics

The second law of thermodynamics describes a fundamental principle governing energy transfer and transformation. It dictates that in any closed system, entropy—a measure of disorder—will inevitably increase over time. This concept explains why heat flows from hotter to colder objects and accounts fo...

William Thomson, 1st Baron Kelvin (1824–1907), was a British mathematical physicist and engineer. He played a central role in formulating the first and second laws of thermodynamics and proposed an absolute temperature scale, now measured in kelvins. Thomson also contributed to the successful laying...

The First Law of Thermodynamics describes a fundamental principle in physics concerning energy. It asserts that within an isolated system, energy is conserved. Energy can change forms – such as kinetic to potential or heat to work – but its total amount remains constant. This law is crucial for unde...

Nicolas Léonard Sadi Carnot (1796–1832) was a French physicist and military engineer whose 1824 treatise Réflexions sur la puissance motrice du feu established foundational principles of heat engine efficiency. The work introduced the idealized cyclic process now called the Carnot cycle, demonstrati...

William Thomson, 1st Baron Kelvin, was a prominent Irish-Scottish mathematician and physicist who played a central role in the development of classical thermodynamics. His most famous contribution was the formulation of the absolute temperature scale, later named the Kelvin scale, which measures tem...

Gilbert N. Lewis was an American chemist prominent in the 20th century. He significantly advanced our understanding of chemical bonding through his development of electron-pair bond theory and Lewis structures. These diagrams provide a visual representation of covalent bonds, fundamentally shaping m...

Jacobus Henricus van 't Hoff was a Dutch chemist influential in physical chemistry during the early 20th century. His work established fundamental connections between thermodynamics, solution behavior, and chemical reactions. He notably investigated osmotic pressure and stereochemistry, significantl...

Lord Kelvin, born William Thomson, was a prominent Irish-Scottish mathematical physicist and engineer who worked in the 19th century. He made significant contributions to the mathematical analysis of electricity and the formulation of the first and second laws of thermodynamics. His most famous lega...

Entropy is a fundamental concept in physics representing the degree of disorder or randomness within a system. It’s closely related to statistical mechanics and thermodynamics, describing the number of possible microscopic arrangements corresponding to a given macroscopic state. This principle expla...

Nicolas Leonard Sadi Carnot was a French physicist who developed foundational concepts in thermodynamics during the early 19th century. His 1824 study of ideal heat engines, particularly the Carnot cycle, established principles relating heat, work, and efficiency. This work remains crucial for under...

William Thomson, Lord Kelvin, was a prominent Victorian-era physicist renowned for his foundational work in thermodynamics. He developed the Kelvin temperature scale, a critical standard for measuring absolute temperature, based on thermodynamic principles. His theoretical investigations significant...

James Prescott Joule was a British physicist renowned for his meticulous experimental work in the early 19th century. His investigations into mechanical work and heat demonstrated that these two phenomena are fundamentally equivalent, establishing heat as a form of energy. This groundbreaking resear...

Hawking radiation describes a theoretical process where black holes emit thermal radiation due to quantum mechanics. This phenomenon arises from the creation of particle-antiparticle pairs near the event horizon, with one particle escaping while the other falls into the black hole. The emission caus...

Ludwig Boltzmann was an Austrian physicist profoundly influential in the 19th century. He developed statistical mechanics, a theoretical approach linking the microscopic properties of matter like atoms with macroscopic phenomena such as thermodynamics and entropy. His work provided a probabilistic u...

The Carnot cycle represents the highest possible efficiency for any heat engine converting thermal energy into work. It’s defined by a series of reversible processes – isothermal expansion and contraction alongside adiabatic changes – between two temperature reservoirs. This concept is fundamental t...

Black hole thermodynamics explores the physical properties of black holes by applying principles of thermodynamics. It proposes that these cosmic objects exhibit temperature due to quantum effects and possess entropy, a measure of disorder. This concept, known as Hawking radiation, indicates that bl...

The Third Law of Thermodynamics describes behavior in physics concerning low-temperature systems. It posits that the entropy of a perfectly ordered crystalline substance approaches a minimum value as the temperature nears absolute zero. This law is crucial for understanding and predicting thermodyna...

John Ferry is an American geologist and professor at Johns Hopkins University. He is recognized in the field of earth sciences for his extensive research on fluid-rock interactions, thermodynamics, and mineral equilibria during regional metamorphism. His work involves analyzing chemical reactions in...

The Zeroth Law of Thermodynamics establishes the fundamental relationship between temperature and thermal equilibrium. It defines that if two separate systems independently reach thermal equilibrium with a common third system, they will simultaneously achieve thermal equilibrium with each other. Thi...

Gibbs free energy is a thermodynamic concept quantifying the potential energy available in a system for doing useful work. It combines enthalpy (heat) and entropy (disorder) to determine whether a chemical process will occur spontaneously at constant temperature and pressure. This value predicts rea...

Josiah Willard Gibbs was a pioneering American physicist and chemist whose groundbreaking work fundamentally shaped our understanding of matter and energy. He established chemical thermodynamics and statistical mechanics, developing sophisticated mathematical tools to analyze systems like heat and f...

William Thomson, later Lord Kelvin, was a prominent 19th-century British physicist and engineer. His work fundamentally shaped our understanding of thermodynamics, leading to the establishment of the absolute temperature scale. He made significant contributions across multiple scientific disciplines...

Mark Ghiorso is an American geochemist and igneous petrologist recognized for his foundational contributions to computational thermodynamics. He is best known as the lead developer of MELTS, a software package and thermodynamic model used to simulate magma crystallization and phase equilibria. MELTS...

Helmholtz free energy is a thermodynamic concept describing the potential energy available in a closed system under conditions of constant temperature and volume. It’s calculated using internal energy, temperature, and entropy. This value represents the maximum work that can be extracted from the sy...

Caltech geologist known for experimental petrology, high-pressure mineral physics, and co-developing the MELTS thermodynamic model widely used for simulating magmatic systems.

Rudolf Clausius was a German physicist active in the 19th century. He fundamentally shaped our understanding of heat and energy through his development of the second law of thermodynamics. His work introduced the concept of entropy, providing a theoretical framework for analyzing energy transformati...

Sadi Carnot was a French engineer and scientist whose work profoundly shaped the understanding of heat and motion in the 19th century. He meticulously studied steam engines, developing a theoretical framework now known as the Carnot cycle. This analysis established fundamental principles regarding e...

Walther Nernst was a prominent German physicist and chemist active throughout the 20th century. His theoretical work fundamentally shaped our understanding of thermodynamics, specifically leading to the formulation of the third law. Nernst’s investigations into heat capacity, entropy, and chemical e...

George Brayton (1830–1892) was an American mechanical engineer who developed a constant-pressure internal combustion engine in 1872. His engine design, which used liquid fuel injected into a combustion chamber, gave its name to the Brayton cycle—the thermodynamic cycle describing constant-pressure h...