chemistry

Madame d'Orbelin

Madame d'Orbelin 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 Madame d'Orbelin rather than just read about it. In short: Madame d'Orbelin was a chemist from Vienna who claimed to have discovered a technique to render mercury into a solid at room temperature in the 18th century. Referred to as "The Alchemiste" by Benjamin Franklin, d'Orberlin is a late example of an amateur scientist whose work straddled alchemy ("fixing mercury") and the 18th-century "chemical revolution".

Key takeaways

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

Reference excerpt

Madame d'Orbelin was a chemist from Vienna who claimed to have discovered a technique to render mercury into a solid at room temperature in the 18th century. Referred to as "The Alchemiste" by Benjamin Franklin, d'Orberlin is a late example of an amateur scientist whose work straddled alchemy ("fixing mercury") and the 18th-century "chemical revolution". D'Orbelin wrote to Benjamin Franklin three times in 1785, and evidently demonstrated her technique to him in Paris on 26 March of that year. She subsequently reported that she had published her results, and asked Franklin for a small loan. Although none of d'Orbelin's published works are known to have survived, the American Philosophical Society's Franklin archive does include undated instructions, written in French and in another's handwriting, for an experiment involving antimony and saltpeter. Her claim was well-enough known that her discovery of "malleable mercury" was published as fact by a number of sources in subsequent decades, including by Thomas Tegg (1835) and George Palmer Putnam (1851). In 2026, German artist Anselm Kiefer included a painting of d'Orbelin in his collection, The Women Alchemists, which was displayed in Milan's Sala delle Cariatidi as part of the cultural showcase of the 2026 Winter Olympics.

References

Worked examples

Example 1 — a first encounter with Madame d'Orbelin

Start with the simplest possible case. Write down what Madame d'Orbelin 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 Madame d'Orbelin 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 Madame d'Orbelin 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 Madame d'Orbelin

In research: Madame d'Orbelin 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 Madame d'Orbelin 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: Madame d'Orbelin is common in secondary-school and first-year university syllabi. It links to neighbouring topics 18th-century alchemists, 18th-century births, 18th-century chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Madame d'Orbelin 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 Madame d'Orbelin in 20 minutes

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

Frequently asked questions

What is Madame d'Orbelin in simple terms?

Why does Madame d'Orbelin 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 Madame d'Orbelin?

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 Madame d'Orbelin.