Hairpin

Key takeaways

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

Reference excerpt

A hairpin or hair pin is a long device used to hold a person's hair in place. It may be used simply to secure long hair out of the way for convenience or as part of an elaborate hairstyle or coiffure. The earliest evidence for dressing the hair may be seen in carved "Venus figurines" such as the Venus of Brassempouy and the Venus of Willendorf. The creation of different hairstyles, especially among women, seems to be common to all cultures and all periods and many past, and current, societies use hairpins. Hairpins made of metal, ivory, bronze, carved wood, etc. were used in ancient Egypt for securing decorated hairstyles. Such hairpins suggest, as graves show, that many were luxury objects among the Egyptians and later the Greeks, Etruscans, and Romans. Major success came in 1901 with the invention of the spiral hairpin by New Zealand inventor Ernest Godward. This was a predecessor of the hair clip. The hairpin may be decorative and encrusted with jewels and ornaments, or it may be utilitarian, and designed to be almost invisible while holding a hairstyle in place. Some hairpins are a single straight pin, but modern versions are more likely to be constructed from different lengths of wire that are bent in half with a u-shaped end and a few kinks along the two opposite portions. The finished pin may vary from two to six inches in last length. The length of the wires enables placement in several designs of hairstyles to hold the nature in place. The kinks enable retaining the pin during normal movements.

Hairpins in Chinese culture

Hairpins (generally known as fa-zan; Chinese: 髮簪) are an important symbol in Chinese culture. In ancient China, hairpins were worn by men as well as women, and they were essential items for everyday hairstyling, mainly for securing and decorating a hair bun. Furthermore, hairpins worn by women could also represent their social status. In Han Chinese culture, when young girls reached the age of fifteen, they were allowed to take part in a rite of passage known as ji li (Chinese: 筓禮), or "hairpin initiation". This ceremony marked the coming of age of young women. Particularly, before the age of fifteen, girls did not use hairpins as they wore their hair in braids, and they were considered as children. When they turned fifteen, they could be considered as young women after the ceremony, and they started to style their hair as buns secured and embellished by hairpins. This practice indicated that these young women could now enter into marriage. However, if a young woman had not been consented to marriage before age twenty, or she had not yet participated in a coming of age ceremony, she would attend a ceremony when she turned twenty. In comparison with ji li, the male equivalent known as guan li (Chinese: 冠禮) or "hat initiation", usually took place five years later, at the age of twenty. In the 21st century Hanfu Movement, an attempt to revive the traditional Han Chinese coming of age ceremonies has been made, and the ideal age to attend the ceremony is twenty years old for all genders. While hairpins can symbolize the transition from childhood to adulthood, they were closely connected to the concept of marriage as well. At the time of an engagement, the fiancée may take a hairpin from her hair and give it to her fiancé as a pledge: this can be seen as a reversal of the Western tradition, in which the future groom presents an engagement ring to his betrothed. After the wedding ceremony, the husband should put the hairpin back into his spouse's hair. Hair has always carried many psychological, philosophical, romantic, and cultural meanings in Chinese culture. In Han culture, people call the union between two people jie-fa (Chinese: 結髮), literally "tying hair". During the wedding ceremony, some Chinese couples exchange a lock of hair as a pledge, while others break a hairpin into two parts, and then, each of the betrothed take one part with them for keeping. If this couple were ever to get separated in the future, when they reunite, they can piece the two halves together, and the completed hairpin would serve as a proof of their identities as well as a symbol of their reunion. In addition, a married couple is sometimes referred to as jie-fa fu-qi (Chinese: 結髮夫妻), an idiom which implies the relationship between the pair is very intimate and happy, just like how their hair has been tied together.

Gallery

Illustrations

Worked examples

Example 1 — a first encounter with Hairpin

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

In research: Hairpin 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 Hairpin 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: Hairpin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fasteners, Hairdressing, Types of jewellery, so understanding it makes those chapters shorter.
In everyday life: Look for Hairpin 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.

How to study Hairpin in 20 minutes

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

Frequently asked questions

What is Hairpin in simple terms?

A hairpin or hair pin is a long device used to hold a person's hair in place. It may be used simply to secure long hair out of the way for convenience or as part of an elaborate hairstyle or coiffure.

Why does Hairpin 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 Hairpin?

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 Hairpin.