astronomy

Hasok Chang

Hasok Chang is a astronomy 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 Hasok Chang rather than just read about it. In short: Hasok Chang (Korean: 장하석; born March 26, 1967) is a South Korean-born American historian and philosopher of science currently serving as the Hans Rausing Professor at the Department of History and Philosophy of Science at the University of Cambridge and a board member of the Philosophy of Science Association. He previously served as president of the British Society for the History of Science from 2012 to 2014.

Key takeaways

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

Reference excerpt

Hasok Chang (Korean: 장하석; born March 26, 1967) is a South Korean-born American historian and philosopher of science currently serving as the Hans Rausing Professor at the Department of History and Philosophy of Science at the University of Cambridge and a board member of the Philosophy of Science Association. He previously served as president of the British Society for the History of Science from 2012 to 2014. His areas of interest include the history and philosophy of chemistry and physics, the philosophy of scientific practice, measurement in quantum mechanics, realism, scientific evidence, pluralism and pragmatism.

Early life and education Chang was born in Seoul in 1967 to Korean civil servant (later politician) Che-Shik Chang and teacher Woo Sook Choi. Chang is the younger brother of economist Ha-Joon Chang and cousin of economist and Korea University professor Hasung Jang. He is married to psychotherapist Gretchen Siglar. Chang studied at Northfield Mount Hermon School, Massachusetts, where he was valedictorian in 1985, and he was a visiting student at Hampshire College in Massachusetts. He graduated at the California Institute of Technology in 1989 with a B.S. Honors in an Independent Studies Program, concentrating on theoretical physics and philosophy. He went to Stanford University where he completed his Ph.D. in philosophy in 1993. His dissertation topic was entitled, Measurement and the Disunity of Quantum Physics. He was also a visiting graduate student at Harvard University.

Career and awards Chang was a research associate in physics at Harvard University from July 1993 to December 1994. In 1995 he moved to the United Kingdom where he worked as a lecturer at University College London's Department of Science and Technology Studies, becoming a professor in 2008. Chang moved to the University of Cambridge in 2010, becoming the Hans Rausing Professor of History and Philosophy of Science. He worked as a consultant on BBC Four's series Shock and Awe: The Story of Electricity and Channel 4's Genius of Britain: The Scientists Who Changed the World. He appeared on EBS's series Chang Hasok's Science Meets Philosophy from February to May 2014, where he delivered lectures in Korean. Chang is a founding member of the Committee for Integrated History and Philosophy of Science and the Society for Philosophy of Science in Practice, and he served as president of the British Society for the History of Science from 2012 to 2014 and vice-president from 2014 to 2015. He won the Lakatos Award in 2006 for his book Inventing Temperature: Measurement and Scientific Progress and in 2013 he won the Fernando Gil International Prize for the Philosophy of Science for his book Is Water H2O?: Evidence, Realism and Pluralism. On May 10, 2016, he gave the Wilkins-Bernal-Medawar Lecture at the Royal Society. He was awarded the Abraham Pais Prize for History of Physics in 2021 from the American Physical Society "For innovative and influential studies on the history and philosophy of the physical sciences, including scholarly works on scientific evidence, the physics-chemistry interaction, and historical and epistemic aspects of thermal physics."

Bibliography

English Inventing Temperature: Measurement and Scientific Progress (2004) Is Water H2O?: Evidence, Realism and Pluralism (2012) Realism for Realistic People: A New Pragmatist Philosophy of Science (2022)

Korean 장하석의 과학, 철학을 만나다 (Science Meets Philosophy) (2014)

Media appearances Horizon, "What is One Degree?" (January 10, 2011) – Interviewed by Ben Miller Nova – Absolute Zero: The Conquest of Cold (January 8, 2008) Chang Hasok's Science Meets Philosophy (February–May 2014) – Aired on EBS

See also Pictet's experiment, which Chang drew attention to in Inventing Temperature and a 2002 article.

References

External links Hasok Chang on academia.edu Hasok Chang at IMDb

Illustrations

Worked examples

Example 1 — a first encounter with Hasok Chang

Start with the simplest possible case. Write down what Hasok Chang claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Hasok Chang 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 Hasok Chang 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 Hasok Chang

In research: Hasok Chang appears in astronomy 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 Hasok Chang 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: Hasok Chang is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1967 births, 20th-century American philosophers, 21st-century American historians, so understanding it makes those chapters shorter.
In everyday life: Look for Hasok Chang 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 Hasok Chang in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hasok Chang 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 Hasok Chang out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hasok Chang in simple terms?

Why does Hasok Chang matter?

Because it connects several astronomy 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 Hasok Chang?

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 Hasok Chang.