science

Nine Diaries

Nine Diaries 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 Nine Diaries rather than just read about it. In short: Jih-chi chiu-chung (Nine Diaries) was the most popular book published by Chinese writer Yu Dafu. Written in 1927, it detailed the events of his affair with the leftist writer Wang Ying-hsia and broke all previous Chinese sales records.

Key takeaways

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

Reference excerpt

Jih-chi chiu-chung (Nine Diaries) was the most popular book published by Chinese writer Yu Dafu. Written in 1927, it detailed the events of his affair with the leftist writer Wang Ying-hsia and broke all previous Chinese sales records.

References Encyclopædia Britannica 2005 Ultimate Reference Suite DVD, article "Yü Ta-fu"

Worked examples

Example 1 — a first encounter with Nine Diaries

Start with the simplest possible case. Write down what Nine Diaries 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 Nine Diaries 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 Nine Diaries 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 Nine Diaries

In research: Nine Diaries 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 Nine Diaries 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: Nine Diaries is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1927 books, China stubs, Geography book stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Nine Diaries 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 Nine Diaries in 20 minutes

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

Frequently asked questions

What is Nine Diaries in simple terms?

Why does Nine Diaries 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 Nine Diaries?

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 Nine Diaries.