science

Zhàng

Zhàng 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 Zhàng rather than just read about it. In short: The zhàng (Chinese: 丈) is a customary Chinese unit of length equal to 10 chi (Chinese feet). Its value varied over time and place with different values of the chi, although it was occasionally standardized.

Key takeaways

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

Reference excerpt

The zhàng (Chinese: 丈) is a customary Chinese unit of length equal to 10 chi (Chinese feet). Its value varied over time and place with different values of the chi, although it was occasionally standardized. In 1915, the Republic of China set it equal to about 3.2 meters or 3.50 yards. In 1930, this was revised to an exact value of 3⅓ meters (about 3.645 yd). It is not commonly used in mainland China today but appears in traditional Chinese architecture, where it was commonly used to measure bays. In Japanese units of measurement, the jō (丈) is equivalent to ten shaku, or 3.03 meters.

Worked examples

Example 1 — a first encounter with Zhàng

Start with the simplest possible case. Write down what Zhàng 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 Zhàng 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 Zhàng 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 Zhàng

In research: Zhàng 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 Zhàng 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: Zhàng is common in secondary-school and first-year university syllabi. It links to neighbouring topics China stubs, Chinese units of measurement, Customary units of measurement, so understanding it makes those chapters shorter.
In everyday life: Look for Zhàng 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Zhàng” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Zhàng in 20 minutes

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

Frequently asked questions

What is Zhàng in simple terms?

Why does Zhàng 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 Zhàng?

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 Zhàng.