physics

Shen Zhu

Shen Zhu is a physics 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 Shen Zhu rather than just read about it. In short: Shen Zhu or God Pig, sometimes known as Holy pig (traditional Chinese: 神豬; simplified Chinese: 神猪; pinyin: shénzhū; Wade–Giles: shen-chu; Pe̍h-ōe-jī: sîn-tu), are pigs that have been chronically fattened for use in Hakka religious and cultural ceremonies, such as the Yimin Festival and the Lunar New Year celebration in Sanxia, northern Taiwan. Pigs are fattened in a process similar to gavage to make them as large as…

Key takeaways

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

Reference excerpt

Shen Zhu or God Pig, sometimes known as Holy pig (traditional Chinese: 神豬; simplified Chinese: 神猪; pinyin: shénzhū; Wade–Giles: shen-chu; Pe̍h-ōe-jī: sîn-tu), are pigs that have been chronically fattened for use in Hakka religious and cultural ceremonies, such as the Yimin Festival and the Lunar New Year celebration in Sanxia, northern Taiwan. Pigs are fattened in a process similar to gavage to make them as large as possible in preparation for contests and awards at the festival. The heaviest pig is declared the winner, and the owner may receive a prize. The winning pig and other pigs entered into the contest are ritually killed as a sacrifice to the City God or a local deity, one popular temple that continues this tradition is Changfu Temple which is dedicated to the deified Buddhist monk Master Qingshui. However, contrary to popular belief, the pig is not sacrificed to Master Qingshui, but to the mountain deities. After being slaughtered, the hair of the winning pig is removed or the bristles shaved into patterns, and the skin is stretched across a metal frame. Further decorations are added, such as placing a pineapple in the pig's mouth. The stretched skin, along with the carcasses or stretched skins of the other fattened pigs, are then paraded on a float. Many Holy pigs end up weighing over 800 kilograms (1,800 lb), whereas a normal pig would weigh only 120 kilograms (260 lb). The tradition of sacrificing fattened pigs did not become commonplace at the centuries-old Yimin Festival until the early 20th century, and it was "turbocharged" in the late 21st century. In urban areas with no access to farms housing such large animals, or places where animal cruelty objections have been raised, the contests instead have become art projects for children to create decorated pig statues. The 2020 Yimin Festival had two entries that were made up of rice packets displayed in the shape of a pig.

Controversy The practice of feeding the pigs to become so heavy has been criticized as inhumane, partly because the great weights limit the pig's movements and strains their internal organs. Animal welfare advocates, like the Environment and Animal Society of Taiwan, note that the pigs are often force fed, kept in small cages, and so heavy they can't stand up.

References

Illustrations

Worked examples

Example 1 — a first encounter with Shen Zhu

Start with the simplest possible case. Write down what Shen Zhu claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, 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 Shen Zhu 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 Shen Zhu 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 Shen Zhu

In research: Shen Zhu appears in physics 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 Shen Zhu 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: Shen Zhu is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal welfare, Culture of Taiwan, Force-feeding, so understanding it makes those chapters shorter.
In everyday life: Look for Shen Zhu 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 Shen Zhu in 20 minutes

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

Frequently asked questions

What is Shen Zhu in simple terms?

Why does Shen Zhu matter?

Because it connects several physics 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 Shen Zhu?

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 Shen Zhu.