science

Kilner jar

Kilner jar 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 Kilner jar rather than just read about it. In short: A Kilner jar is a rubber-sealed glass jar used for preserving (bottling) food. It was first produced by John Kilner & Co., Yorkshire, England.

Key takeaways

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

Reference excerpt

A Kilner jar is a rubber-sealed glass jar used for preserving (bottling) food. It was first produced by John Kilner & Co., Yorkshire, England.

History

The Kilner Jar was invented by John Kilner (1792–1857) and associates and manufactured by the Kilner glass bottlemakers company from Yorkshire, which he set up. The original Kilner bottlemakers operated from 1842, when the company was first founded, until 1937, when the company went into liquidation. In 2003, The Rayware Group purchased the Ravenhead name, including Kilner jar (a subsidiary of Ravenhead), and continues to produce them today in China.

Company names The various names of the Kilner companies were:

John Kilner and Co, Castleford, Yorkshire, 1842–1844 John Kilner and Sons, Wakefield, Yorkshire, 1847–1857 Kilner Brothers Glass Co, Thornhill Lees, Yorkshire, 1857–1873 also at Conisbrough, Yorkshire, 1863–1873 Kilner Brothers Ltd, Thornhill Lees, Yorkshire 1873–1920 also at Conisbrough, Yorkshire, 1873–1937.

Illustrations

Worked examples

Example 1 — a first encounter with Kilner jar

Start with the simplest possible case. Write down what Kilner jar 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 Kilner jar 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 Kilner jar 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 Kilner jar

In research: Kilner jar 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 Kilner jar 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: Kilner jar is common in secondary-school and first-year university syllabi. It links to neighbouring topics Canned food, Food storage containers, Glass jars, so understanding it makes those chapters shorter.
In everyday life: Look for Kilner jar 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 Kilner jar in 20 minutes

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

Frequently asked questions

What is Kilner jar in simple terms?

A Kilner jar is a rubber-sealed glass jar used for preserving (bottling) food. It was first produced by John Kilner & Co., Yorkshire, England.

Why does Kilner jar 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 Kilner jar?

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 Kilner jar.