science

Pica (unit)

Pica (unit) 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 Pica (unit) rather than just read about it. In short: The pica is a typographic unit of measure that has varied in size historically and by jurisdiction. The modern de facto standard size is exactly 1⁄6 of an inch or about 4.23 millimetres.

Key takeaways

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

Reference excerpt

The pica is a typographic unit of measure that has varied in size historically and by jurisdiction. The modern de facto standard size is exactly 1⁄6 of an inch or about 4.23 millimetres. One pica is further divided into 12 points.

Typographic unit In printing, three pica measures are used:

The French pica of 12 Didot points (also called cicero) generally is: 12 × 0.376 = 4.512 mm (0.1776 in). The American pica of 0.16604 in (4.217 mm). It was established by the United States Type Founders' Association in 1886. In TeX one pica is 400⁄2,409 of an inch. The contemporary computer PostScript pica is exactly 1⁄6 of an inch, i.e. 0.16 in or 4.23 mm. Publishing applications such as Adobe InDesign and QuarkXPress represent pica measurements with whole-number picas left of a lower-case p, followed by the points number, for example: 5p6 represents 5 picas and 6 points, or 51⁄2 picas. Cascading Style Sheets (CSS) defined by the World Wide Web Consortium use pc as the abbreviation for pica (1⁄6 of an inch), and pt for point (1⁄72 of an inch). The pica is also used in measuring the font capacity and is applied in the process of copyfitting. The font length is measured there by the number of characters per pica (cpp). As books are most often printed with proportional fonts, cpp of a given font is usually a fractional number. For example, an 11-point font (like Helvetica) may have 2.4 cpp, thus a 5-inch (30-pica) line of a usual octavo-sized (6×8 in) book page would contain around 72 characters (including spaces). There have existed copyfitting tables for a number of typefaces, and typefoundries often provided the number of characters per pica for each type in their specimen catalogs. Similar tables exist as well with which one can estimate the number of characters per pica knowing the lower-case alphabet length.

See also Pica (disambiguation) Pica (type) – Font used by many typewriters, ten-characters-per-inch pitch Pitch (typewriter) – Number of glyphs in 1 inch of text (monospaced fonts only) Traditional point-size names – Names used in printing, includes a size called pica in US usage

References

Bringhurst, Robert (1999). The Elements of Typographic Style (2nd ed.). H&M Publishers. pp. 294–295. ISBN 0881791326. Pasko, W. W. (1894). "Pica". American Dictionary of Printing and Bookmaking. H. Lockwood. p. 436.

Illustrations

Worked examples

Example 1 — a first encounter with Pica (unit)

Start with the simplest possible case. Write down what Pica (unit) 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 Pica (unit) 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 Pica (unit) 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 Pica (unit)

In research: Pica (unit) 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 Pica (unit) 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: Pica (unit) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Customary units of measurement in the United States, Typography, Units of length, so understanding it makes those chapters shorter.
In everyday life: Look for Pica (unit) 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 Pica (unit) in 20 minutes

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

Frequently asked questions

What is Pica (unit) in simple terms?

The pica is a typographic unit of measure that has varied in size historically and by jurisdiction. The modern de facto standard size is exactly 1⁄6 of an inch or about 4.23 millimetres.

Why does Pica (unit) 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 Pica (unit)?

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 Pica (unit).