science

Johan Conrad van Hasselt

Johan Conrad van Hasselt is a science 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 Johan Conrad van Hasselt rather than just read about it. In short: Johan Conrad van Hasselt (occasionally Johan Coenraad van Hasselt; 24 June 1797 in Doesburg – 8 September 1823), was a Dutch medical doctor, zoologist, botanist and mycologist. Conrad van Hasselt studied medicine at the University of Groningen.

Key takeaways

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

Reference excerpt

Johan Conrad van Hasselt (occasionally Johan Coenraad van Hasselt; 24 June 1797 in Doesburg – 8 September 1823), was a Dutch medical doctor, zoologist, botanist and mycologist. Conrad van Hasselt studied medicine at the University of Groningen. In 1820 he went on an expedition to the island of Java, then part of the colonial Dutch East Indies, with his friend Heinrich Kuhl, to study the fauna and flora of the island. They sailed from Texel on 11 July, stopping at Madeira, the Cape of Good Hope and Cocos Island and arriving in Batavia in December 1820. Kuhl died after eight months, van Hasselt continued the work for another two years before dying (like Kuhl) of disease and exhaustion. This followed a journey to Bantam. They sent the Museum of Leiden 200 skeletons, 200 skins of mammals from 65 species, 2,000 bird skins, 1,400 fish, 300 reptiles and amphibians, and many insects and crustaceans.

Works Heinrich Kuhl and Johan Conrad van Hasselt. 1820. Beiträge zur Zoologie und Vergleichende anatomie (Contributions to zoology and comparative anatomy). Ed. Hermann. 212 pp. 1820 Dissertatio medico-anatomical observation of metamorphosi inauguralis exhibens quarumdam partium Ranae temporariae ... Ed apud I. Oomkens. 51 pp. Tyson R Roberts. 1993. The freshwater fishes of Java, as observed by Kuhl and van Hasselt in 1820-23. Leiden : Nationaal Natuurhistorisch Museum. 94 pp.

Commemorations Hasseltia (H.B.K. 1825); botanical family Salicaceae. Hasseltiopsis (Sleumer 1938); botanical family Salicaceae. Kuhlhasseltia, named with Heinrich Kuhl (J.J.Sm. 1910); botanical family Orchidaceae.

See also Category:Taxa named by Johan Conrad van Hasselt

References

Roberts T. R. 1993. The freshwater fishes of Java, as Observed by Kuhl and van Hasselt in 1820-23. Zoologische Vol. 285, verhandelingen. Ed Natuurhistorisch Nationaal Museum. 94 pp. ISBN 90-73239-17-6 pdf

Illustrations

Worked examples

Example 1 — a first encounter with Johan Conrad van Hasselt

Start with the simplest possible case. Write down what Johan Conrad van Hasselt claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Johan Conrad van Hasselt 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 Johan Conrad van Hasselt 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 Johan Conrad van Hasselt

In research: Johan Conrad van Hasselt appears in science 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 Johan Conrad van Hasselt 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: Johan Conrad van Hasselt is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1797 births, 1823 deaths, 19th-century Dutch medical doctors, so understanding it makes those chapters shorter.
In everyday life: Look for Johan Conrad van Hasselt 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 Johan Conrad van Hasselt in 20 minutes

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

Frequently asked questions

What is Johan Conrad van Hasselt in simple terms?

Why does Johan Conrad van Hasselt matter?

Because it connects several science 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 Johan Conrad van Hasselt?

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 Johan Conrad van Hasselt.