science

Resist

Resist 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 Resist rather than just read about it. In short: A resist, used in many areas of manufacturing and art, is something that is added to parts of an object to create a pattern by protecting these parts from being affected by a subsequent stage in the process. Often the resist is then removed.

Key takeaways

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

Reference excerpt

A resist, used in many areas of manufacturing and art, is something that is added to parts of an object to create a pattern by protecting these parts from being affected by a subsequent stage in the process. Often the resist is then removed. For example, in the resist dyeing of textiles, wax or a similar substance is added to places where the dye is not wanted. The wax will "resist" the dye, and after it is removed there will be a pattern in two colours. Batik, shibori and tie-dye are among many styles of resist dyeing. Wax or grease can also be used as a resist in pottery, to keep some areas free from a ceramic glaze; the wax burns away when the piece is fired. Song dynasty Jizhou ware used paper cut-outs and leaves as resists or stencils under glaze to create patterns. Other uses of resists in pottery work with slip or paints, and a whole range of modern materials used as resists. A range of similar techniques can be used in watercolour and other forms of painting. While these artistic techniques stretch back centuries, a range of new applications of the resist principle have recently developed in microelectronics and nanotechnology. An example is resists in semiconductor fabrication, using photoresists (often just referred to as "resists") in photolithography.

Etching Etching processes use a resist, though in these typically the whole object is covered in the resist (called the "ground" in some contexts), which is then selectively removed from some parts. This is the case when a resist is used to prepare the copper substrate for champlevé enamels, where parts of the field are etched (with acid or electrically) into hollows to be filled with powdered glass, which is then melted. In chemical milling, as many forms of industrial etching are called, the resist may be referred to as the "maskant", and in many contexts the process may be known as masking. A fixed resist pre-shaped with the pattern is often called a stencil, or in some contexts a frisket. The Oxford English Dictionary does not record the word "resist" in this sense before the 1830s, when it was used in relation to both "calico-printing" (1836) and metalwork with copper (1839). Resists were also used to etch steel from the mid-19th century.

Gallery

References

Illustrations

Worked examples

Example 1 — a first encounter with Resist

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

In research: Resist 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 Resist 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: Resist is common in secondary-school and first-year university syllabi. It links to neighbouring topics Artistic techniques, Manufacturing, Pottery, so understanding it makes those chapters shorter.
In everyday life: Look for Resist 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 Resist in 20 minutes

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

Frequently asked questions

What is Resist in simple terms?

Why does Resist 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 Resist?

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 Resist.