science

L'impermeable

L'impermeable 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 L'impermeable rather than just read about it. In short: L'impermeable is the name of one of the first waterproof watches invented in the 1880s and manufactured by Alcide Droz et Fils. Definition of epoxy waterproofing Waterproof (or water-resistant) describes objects unaffected by water or resisting water passage, or which are covered with a material that resists or does not allow water passage.

Key takeaways

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

Reference excerpt

L'impermeable is the name of one of the first waterproof watches invented in the 1880s and manufactured by Alcide Droz et Fils.

Definition of epoxy waterproofing Waterproof (or water-resistant) describes objects unaffected by water or resisting water passage, or which are covered with a material that resists or does not allow water passage. In horology, the waterproofness of a watch is defined by its resistance under pressure. The manufacturers indicate mostly the degree of waterproofness in metres (m), feet (ft) or atmospheres (atm). Watches with the "waterproof" name, with or without indication of overpressure, have to be complied and have to undergo successfully the tests planned in the standard ISO-2281. These watches are intended for a current daily use and have to resist to the water during exercises such as the short-term swimming. So finally watches said waterresistant must : resist to a dive in the water in a depth of at least 100 metres (330 ft), have a system of control of time and answer all the criteria planned by the standard ISO 6425: luminosity, shock resistance, resistance in magnetic fields, solidity of the bracelet.

History Alcide Droz et Fils, later known as the Berna and established in St-Imier in the Bernese Jura since 1864, developed the first attested waterproof watch, named L'Imperméable.

They had the idea to place a seal in the crown of winder, which is screwed on the counterpart. "L'Impermeable" was born: it is the very first waterproof watch intended especially to protect the movement from dust and humidity. This pocket watch is nowadays on display at the International Watchmaking Museum in La Chaux-de-Fonds.

See also Berna (watch brand) West End Watch Co Waterproof Grail-Watch: Droz and Degoumois: Berna Watch Factory vintagewatchstraps.com

References

External links International Watchmaking Museum

Worked examples

Example 1 — a first encounter with L'impermeable

Start with the simplest possible case. Write down what L'impermeable 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 L'impermeable 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 L'impermeable 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 L'impermeable

In research: L'impermeable 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 L'impermeable 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: L'impermeable is common in secondary-school and first-year university syllabi. It links to neighbouring topics Horology, Watches, so understanding it makes those chapters shorter.
In everyday life: Look for L'impermeable 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.

Affiliate

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

How to study L'impermeable in 20 minutes

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

Frequently asked questions

What is L'impermeable in simple terms?

L'impermeable is the name of one of the first waterproof watches invented in the 1880s and manufactured by Alcide Droz et Fils. Definition of epoxy waterproofing Waterproof (or water-resistant) describes objects unaffected by water or resisting water passage, or which are covered with a material th…

Why does L'impermeable 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 L'impermeable?

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 L'impermeable.