chemistry

Samuel Epstein (geochemist)

Samuel Epstein (geochemist) is a chemistry 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 Samuel Epstein (geochemist) rather than just read about it. In short: Samuel Epstein (December 9, 1919 – September 17, 2001) was a Canadian-American geochemist who developed methods for reconstructing geologic temperature records using stable isotope geochemistry. He was elected to the United States National Academy of Sciences in 1977, and a fellow of the Royal Society of Canada in 1997.

Key takeaways

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

Reference excerpt

Samuel Epstein (December 9, 1919 – September 17, 2001) was a Canadian-American geochemist who developed methods for reconstructing geologic temperature records using stable isotope geochemistry. He was elected to the United States National Academy of Sciences in 1977, and a fellow of the Royal Society of Canada in 1997.

Early years Sam Epstein was born in Kobryn, Belarus, then part of Poland, and as a child his family emigrated to Winnipeg, Manitoba. After receiving a B.Sc. in Geology and Chemistry (1941) and a M.Sc. in Chemistry (1942) from the University of Manitoba, Epstein completed his Ph.D. at McGill University under the supervision of Carl A. Winkler in 1944. His thesis focused on the synthesis and reaction kinetics of high explosives, including RDX and HMX. Epstein subsequently worked for the Canadian Atomic Energy Project for several years.

Career In 1947, Epstein moved to the United States to begin a research fellowship with Harold Urey's group at the University of Chicago. While at Chicago, Epstein, along with Ralph Buchsbaum, Heinz A. Lowenstam, C. R. McKinney and others developed the carbonate-water isotopic temperature scale, allowing ancient ocean temperatures to be determined from precise measurements of 18O/16O in geological samples of calcium carbonate. This method is still the most widely used geochemical climate proxy for locations and times not sampled in ice core records. Epstein joined the faculty of the California Institute of Technology in 1952, and continued to explore the new field of stable isotope geochemistry. He and his students used mass spectrometry to study natural variations in the isotopic abundances of hydrogen, carbon, oxygen and silicon, with applications to archeology, biochemistry, climatology, and geology. He was awarded the Wollaston Medal of the Geological Society of London in 1993. Epstein remained at Caltech as a Professor and Professor Emeritus until shortly before his death on September 17, 2001. The European Association of Geochemistry awards a Science Innovation Award medal every five years named in his honour for work in isotope geochemistry.

References

External links Obituary, California Institute of Technology V. M. Goldschmidt award winners Hugh P. Taylor Jr. and Robert N. Clayton, "Samuel Epstein", Biographical Memoirs of the National Academy of Sciences (2008)

Worked examples

Example 1 — a first encounter with Samuel Epstein (geochemist)

Start with the simplest possible case. Write down what Samuel Epstein (geochemist) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Samuel Epstein (geochemist) 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 Samuel Epstein (geochemist) 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 Samuel Epstein (geochemist)

In research: Samuel Epstein (geochemist) appears in chemistry 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 Samuel Epstein (geochemist) 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: Samuel Epstein (geochemist) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1919 births, 2001 deaths, California Institute of Technology faculty, so understanding it makes those chapters shorter.
In everyday life: Look for Samuel Epstein (geochemist) 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 Samuel Epstein (geochemist) in 20 minutes

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

Frequently asked questions

What is Samuel Epstein (geochemist) in simple terms?

Why does Samuel Epstein (geochemist) matter?

Because it connects several chemistry 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 Samuel Epstein (geochemist)?

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 Samuel Epstein (geochemist).