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2. Pica (typography) - Wikipedia

   en.wikipedia.org/wiki/Pica_(typography)

   4.2333 mm. The pica is a typographic unit of measure corresponding to approximately 1⁄6 of an inch, or from 1⁄68 to 1⁄73 of a foot. One pica is further divided into 12 points. 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).

3. Aspect ratio (image) - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio_(image)

   A good example of this a 4×6 print (6 inch wide by 4 inch tall landscape) perfectly matches the 3:2 aspect ratio of a DSLR/35 mm, since 6/2=3 and 4/2=2. For analog projection of photographic slides, projector and screen use a 1:1 aspect ratio, supporting horizontal and vertical orientation equally well.

4. Inch - Wikipedia

   en.wikipedia.org/wiki/Inch

   Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as ⁠2 + 3 / 8 ⁠ ″ and not as 2.375″ nor as ⁠2 + 6 / 16 ⁠ ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been ...

5. Image sensor format - Wikipedia

   en.wikipedia.org/wiki/Image_sensor_format

   Sizes are often expressed as a fraction of an inch, with a one in the numerator, and a decimal number in the denominator. For example, 1/2.5 converts to 2/5 as a simple fraction, or 0.4 as a decimal number. This "inch" system gives a result approximately 1.5 times the length of the diagonal of the sensor.

6. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   1/2 4 = 0.0625 250 × 353: 9.8 × 13.9 ... Smaller sizes are derived by halving as usual and just get a vulgar fraction ... if a sheet 17 × 11 inches is to be folded ...

7. 2,4,6-Tris (dimethylaminomethyl)phenol - Wikipedia

   en.wikipedia.org/wiki/2,4,6-Tris(dimethylamino...

   2,4,6-Tris (dimethylaminomethyl)phenol. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). 2,4,6-Tris (dimethylaminomethyl)phenol is an aromatic organic chemical that has tertiary amine and phenolic hydroxyl functionality in the same molecule. [1] The formula is C 15 H 27 N 3 O and ...