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2. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10 −2 metres (⁠ 1 / 100 ⁠ m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimeters; 1 cm – 0.39 inches; 1 cm – edge of a square of area 1 cm 2

3. Ruler - Wikipedia

   en.wikipedia.org/wiki/Ruler

   A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

4. Metre-stick - Wikipedia

   en.wikipedia.org/wiki/Metre-stick

   A metrestick divided into 1,000 mm and labeled with 100 cm. A metre-stick, metrestick (or meter-stick and meterstick as alternative spellings); [1] or yardstick [2] is either a straightedge or foldable ruler used to measure length, and is especially common in the construction industry.

5. Millimetre - Wikipedia

   en.wikipedia.org/wiki/Millimetre

   Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

6. Unit of length - Wikipedia

   en.wikipedia.org/wiki/Unit_of_length

   A ruler, depicting two customary units of length, the centimeter and the inch ... and millimeters (mm). Centimeters ... parsec pc ≈ 30 856 775 814 671.9 km or about ...

7. Cun (unit) - Wikipedia

   en.wikipedia.org/wiki/Cun_(unit)

   In the twentieth century in the Republic of China, the lengths were standardized to fit with the metric system, and in current usage in People's Republic of China and Taiwan [citation needed] it measures ⁠3 + 1 / 3 ⁠ cm (~1.312 in). In Japan, the corresponding unit, sun (寸), was standardized at 1000 ⁄ 33 mm (3. 03 cm, ~1.193 in, or ~0. ...

8. Scale ruler - Wikipedia

   en.wikipedia.org/wiki/Scale_ruler

   A scale ruler is a tool for measuring ... Architect's scale rulers used in Britain and other metric countries are marked ... Referred to as 1:10, 1:20, 1:30,1 ...

9. Coggeshall slide rule - Wikipedia

   en.wikipedia.org/wiki/Coggeshall_slide_rule

   The Coggeshall rule consisted of two rulers, each a foot (30 cm) long, which were put together in various ways. The most common and convenient arrangement was to have one of the rulers slide within a groove made along the middle of the other, like an ordinary linear slide rule, as shown in the figure below.