science

Pertica (unit)

Pertica (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 Pertica (unit) rather than just read about it. In short: The pertica (from Latin: pertica, measuring rod) was a pre-metric unit of either length or area, with the values varying by location. For a similar unit in Northern Europe, see perch.

Key takeaways

Pertica (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 Pertica (unit) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pertica (unit) from memory before moving on to harder problems.

Reference excerpt

The pertica (from Latin: pertica, measuring rod) was a pre-metric unit of either length or area, with the values varying by location. For a similar unit in Northern Europe, see perch.

Ancient Rome In the Ancient Rome, pertica, also called decempeda, was a unit of length, usually equal to 10 Roman feet (pedes), or approximately 2.96 meters. The variants of pertica contained 12 and 15 pedes. Isidore of Seville (per Codex Gudianus) states that sometimes a pertica of 10, 12, 15, or 17 pedes was used by agrimensores (Roman land surveyors) to accommodate the richness of the soil and approximately even the yield per unit area. Kidson highlights the near-perfect match between the pertica of 17 pedes and the English version of the perch. The same names, pertica and decempeda, were used for the surveyor's tool, a rod of the corresponding length with subdivision into smaller units, similar to the Ancient Greek kalamos.

Italy

The linear unit in Italy was about 3 meters, area unit contained about 600 square meters. After switching to the metric system, the unit became equal to 1 decare.

The regional area values significantly varied per province (in square meters):

Bergamo 662; Como (milanese) 655; Cremona 808; Pavia 770; Piacenza 762; Sondrio 688.

References

Sources Morwood, James, ed. (2005). The pocket Oxford Latin dictionary: Latin - English. Oxford University Press. ISBN 978-0-19-173958-3. Walthew, C. V. (1981). "Possible Standard Units of Measurement in Roman Military Planning". Britannia. 12: 15–35. doi:10.2307/526241. JSTOR 526241. Kidson, Peter (1990-01-01). "A Metrological Investigation". Journal of the Warburg and Courtauld Institutes. 53 (1): 71–97. doi:10.2307/751340. ISSN 0075-4390. JSTOR 751340. Duncan-Jones, R. P. (1980). "Length-Units in Roman Town Planning: The Pes Monetalis and the Pes Drusianus". Britannia. 11: 127–133. doi:10.2307/525675. JSTOR 525675. Senseney, John R. (2013-10-28). "Plans, Measurement Systems, and Surveying: The Roman Technology of Pre-Building". A Companion to Roman Architecture. Wiley. pp. 140–156. doi:10.1002/9781118325117.ch8. ISBN 978-1-4051-9964-3.

Illustrations

Worked examples

Example 1 — a first encounter with Pertica (unit)

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

In research: Pertica (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 Pertica (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: Pertica (unit) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ancient Roman units of measurement, Obsolete units of measurement, Units of area, so understanding it makes those chapters shorter.
In everyday life: Look for Pertica (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 Pertica (unit) in 20 minutes

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

Frequently asked questions

What is Pertica (unit) in simple terms?

The pertica (from Latin: pertica, measuring rod) was a pre-metric unit of either length or area, with the values varying by location. For a similar unit in Northern Europe, see perch.

Why does Pertica (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 Pertica (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 Pertica (unit).