physics

Hans Hellmann

Hans Hellmann is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hans Hellmann rather than just read about it. In short: Hans Gustav Adolf Hellmann (14 October 1903 – 29 May 1938) was a German theoretical physicist. Biography Hellmann was born in Wilhelmshaven, Prussian Hanover.

Key takeaways

Hans Hellmann belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hans Hellmann to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hans Hellmann from memory before moving on to harder problems.

Reference excerpt

Hans Gustav Adolf Hellmann (14 October 1903 – 29 May 1938) was a German theoretical physicist.

Biography Hellmann was born in Wilhelmshaven, Prussian Hanover. He began studying electrical engineering in Stuttgart but changed to engineering physics after a semester. Hellmann also studied at the University of Kiel. He received his diploma from the Kaiser Wilhelm Institute for Chemistry in Berlin for work on radioactive compounds under Otto Hahn and Lise Meitner. He received his Ph.D. at Stuttgart with Prof. Erich Regener for work on the decomposition of ozone. Hellmann's future spouse Victoria Bernstein was the foster daughter of Regener. In 1929 Hellmann became an assistant professor at the Leibniz University Hannover. After the Nazi rise to power, Hellmann was dismissed on 24 December 1933 as ‘undesirable’ because of his Jewish wife. He emigrated to the Soviet Union, taking up a position at the Karpov institute in Moscow working among other things on pseudopotentials. However, he was later denounced during the Great Purge, imprisoned on 10 May 1938 and executed in Butovo on 29 May. His son, Hans Hellmann, Jr., was only allowed to leave the former Soviet Union in 1991. In science, his name is primarily associated with the Hellmann–Feynman theorem, as well as with one of the first-ever textbooks on quantum chemistry (‘Kvantovaya Khimiya’, 1937; translated into German as ‘Einfuehrung in die Quantenchemie’, Vienna, 1937). He pioneered several approaches now commonplace in quantum chemistry, notably the use of pseudopotentials.

Notes

References "Short biography of Hans G.A. Hellmann (1903-1938)". chemie.uni-siegen.de. Archived from the original on January 15, 2022. Translation of W.H.E. Schwarz, D. Andrae, S.R. Arnold, J. Heidberg, H. Hellmann jr., J. Hinze, A. Karachalios, M.A. Kovner, P.C. Schmidt, L. Zülicke translated by Mark Smith and W.H.E. Schwarz (1999). "Hans G.A. Hellmann (1903-1938) A Pioneer of Quantum Chemistry" (PDF). Bunsen - Magazin (1 and 2): 10–21 and 60–70.{{cite journal}}: CS1 maint: multiple names: authors list (link) Siegen university site Complete list of publications of Hans Hellmann (Freie Universität Berlin)

Illustrations

Worked examples

Example 1 — a first encounter with Hans Hellmann

Start with the simplest possible case. Write down what Hans Hellmann claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hans Hellmann before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hans Hellmann ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hans Hellmann

In research: Hans Hellmann appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hans Hellmann in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hans Hellmann is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1903 births, 1938 deaths, 20th-century German chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Hans Hellmann outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hans Hellmann in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hans Hellmann means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hans Hellmann out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hans Hellmann in simple terms?

Hans Gustav Adolf Hellmann (14 October 1903 – 29 May 1938) was a German theoretical physicist. Biography Hellmann was born in Wilhelmshaven, Prussian Hanover.

Why does Hans Hellmann matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hans Hellmann?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hans Hellmann.