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Walther Nernst

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Walther Hermann Nernst was a prominent German physical chemist.

Walther Nernst
Walther Nernst

He made essential contributions to thermodynamics, physical chemistry, electrochemistry, and solid-state physics. His work helped bridge the gap between pure physics and chemical science. One of his most vital achievements was the formulation of the Nernst heat theorem. This discovery helped establish the third law of thermodynamics. Because of this work, he was awarded the Nobel Prize in Chemistry in 1920. His research allowed chemists to determine free energies and equilibrium points of chemical reactions using heat measurements.

Nernst's scientific career involved studying many complex processes. In 1887, he developed the Nernst equation. This equation describes the electrical potential generated by unequal concentrations of an ion. This happens when ions are separated by a membrane that is permeable to those ions. Today, this equation remains widely used in the fields of neurobiology and cell physiology. He also discovered the Ettingshausen and Nernst effects. These effects describe how magnetic fields and temperature gradients interact with metallic conductors. A magnetic field applied perpendicular to a conductor in a temperature gradient creates an electrical potential difference. Conversely, an electrical potential difference can produce a thermal gradient.

Nernst was a prolific inventor who applied his scientific knowledge to industry.

He developed the Nernst glower, which is a solid-body radiator. This device uses a filament made of rare-earth oxides. It operates best at wavelengths between 2 and 14 micrometers. The glower provides bright light after a specific warm-up period. This invention became very important in the field of infrared spectroscopy. He also worked on the Neo-Bechstein-Flügel, an early electric piano. This instrument used vacuum tube amplifiers and electromagnetic pickups. It produced electronically modified sound in a way similar to a modern electric guitar.

His academic journey took him across several major European universities.

Tablica pamiątkowa ku pamięci Walthera Nersta
Tablica pamiątkowa ku pamięci Walthera Nersta

He studied physics and mathematics at the universities of Zürich, Berlin, Graz, and Würzburg. He received his doctorate in 1887 from the University of Würzburg. In 1889, he completed his habilitation at the University of Leipzig. He later held positions at Heidelberg University and the University of Göttingen. Eventually, he moved to Berlin, where he was awarded the title of Geheimrat. He also served as the Rector of Berlin University from 1921 to 1922.

Nernst's theoretical work reached a peak with his 1905 proposal of the "New Heat Theorem."

Nernst-9
Nernst-9

This theory is now recognized as the third law of thermodynamics. He demonstrated that as temperature approaches absolute zero, entropy approaches zero. At the same time, the free energy remains above zero. His laboratory also discovered that specific heats fall markedly at low temperatures. This observation was later supported by Albert Einstein's 1909 paper on the quantum mechanics of specific heats at cryogenic temperatures. Nernst was so impressed by Einstein's work that he traveled from Berlin to Zürich to meet him.

Nernst's life was marked by significant social and political changes. He lived through World War I and served as a Staff Scientific Advisor in the Imperial German Army. During this time, he directed research on explosives and developed guanidine perchlorate. He also worked on the development of trench mortars. In 1918, he proposed the atomic chain reaction theory. This theory suggests that certain reactions produce free atoms that decompose other molecules, creating a chain. This concept is closely related to the natural process of nuclear fission. Later, he became a vocal critic of Adolf Hitler and the Nazi party.

In 1933, Nernst faced professional difficulties due to his refusal to comply with government racial policies. He was dismissed from the board of the Kaiser Wilhelm Institute. Despite these challenges, he remained a respected figure in the global scientific community. He lived quietly in the country until his death in 1941. He was buried three different times, finally resting in Göttingen, Germany, near other great scientists like Max Planck and Otto Hahn. His legacy lives on through the many scientific principles that still bear his name.

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