science

Micri-

Micri- 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 Micri- rather than just read about it. In short: Micri- (unit symbol mc-) is an archaic non-SI decimal metric prefix for 10−14. It was proposed as a prefix for the CGS-unit of energy, the erg.

Key takeaways

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

Reference excerpt

Micri- (unit symbol mc-) is an archaic non-SI decimal metric prefix for 10−14. It was proposed as a prefix for the CGS-unit of energy, the erg. The micrierg was proposed in 1922 by William Draper Harkins as a unit of energy equating to 10−14 erg, the equivalent to 10−21 joule, as a convenient unit to measure the surface energy of molecules in surface chemistry. It saw limited use. One electronvolt is about 160 micriergs. In 1991, the micrierg was officially designated the zeptojoule when the zepto- prefix for 10−21 was officially adopted.

Worked examples

Example 1 — a first encounter with Micri-

Start with the simplest possible case. Write down what Micri- 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 Micri- 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 Micri- 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 Micri-

In research: Micri- 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 Micri- 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: Micri- is common in secondary-school and first-year university syllabi. It links to neighbouring topics Decimal prefixes, Greek words and phrases, Metric prefixes, so understanding it makes those chapters shorter.
In everyday life: Look for Micri- 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 Micri- in 20 minutes

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

Frequently asked questions

What is Micri- in simple terms?

Micri- (unit symbol mc-) is an archaic non-SI decimal metric prefix for 10−14. It was proposed as a prefix for the CGS-unit of energy, the erg.

Why does Micri- 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 Micri-?

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 Micri-.