Millimetre
| millimetre | |
|---|---|
 Ruler with millimetre and centimetre marks | |
| General information | |
| Unit system | SI |
| Unit of | Length |
| Symbol | mm |
| Named after | The metric prefix mille (Latin for "one thousand") and the metre |
| Conversions | |
| 1 mm in ... | ... is equal to ... |
| micrometres | 1×103 μm = 1000 μm |
| centimetres | 1×10−1 cm = 0.1 cm |
| metres | 1×10−3 m = 0.001 m |
| kilometres | 1×10−6 km |
| inches | 0.039370 in |
| feet | 0.0032808 ft |
thumb|330px|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. Therefore, there are one thousand millimetres in a metre. There are ten millimetres in a centimetre.
One millimetre is equal to 1000 micrometres or 1000000 nanometres. Since an inch is officially defined as exactly 25.4 millimetres, a millimetre is equal to exactly 5⁄127 (≈ 0.03937) of an inch.
Definition
Since 1983, the metre has been defined as "the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second".[1] A millimetre, 1/1000 of a metre, is therefore the distance travelled by light in 1/299792458000 of a second.
Informal terminology
A common shortening of millimetre in spoken English is "mil". This can cause confusion since in the United States, "mil" traditionally means a thousandth of an inch.
Unicode symbols
For the purposes of compatibility with Chinese, Japanese and Korean (CJK) characters, Unicode has symbols for:[2]
- millimetre - U+339C ㎜ SQUARE MM
- square millimetre - U+339F ㎟ SQUARE MM SQUARED
- cubic millimetre U+33A3 ㎣ SQUARE MM CUBED
In Japanese typography, these square symbols are used for laying out unit symbols without distorting the grid layout of text characters.
Measurement
On a metric ruler, the smallest measurements are normally millimetres.[3] High-quality engineering rulers may be graduated in increments of 0.5 mm. Digital callipers are commonly capable of reading increments as small as 0.01 mm.[4]
Microwaves with a frequency of 300 GHz have a wavelength of 1 mm. Using frequencies between 30 GHz and 300 GHz for data transmission, in contrast to the 300 MHz to 3 GHz normally used in mobile devices, has the potential to allow data transfer rates of 10 gigabits per second.[5]
The smallest dimension the human eye can resolve is around 0.02 to 0.04 mm, approximately the width of a thin human hair.[6] A sheet of paper is typically between 0.07 mm and 0.18 mm thick, with ordinary printer paper or copy paper approximately 0.1 mm thick.[7]
See also
References
- ↑ "17th General Conference on Weights and Measures (1983), Resolution 1.". International Bureau of Weights and Measures. http://www.bipm.org/en/CGPM/db/17/1/.
- ↑ "CJK Compatibility". unicode.org. https://www.unicode.org/charts/PDF/U3300.pdf.
- ↑ "How do I read a ruler?". onlineconversion.com. http://www.onlineconversion.com/faq_05.htm.
- ↑ "Accuracy of Calipers". TresnaInstrument.com. http://www.tresnainstrument.com/accuracy_of_calipers.html.
- ↑ Huang, Kao-Cheng; Wang, Zhaocheng (2011). Millimeter Wave Communication Systems. John Wiley & Sons. ISBN 9781118102756. https://books.google.com/books?id=kCmyPdxme1AC&pg=PP15.
- ↑ "How Small Can the Naked Eye See?". Focus Magazine. http://sciencefocus.com/qa/how-small-can-naked-eye-see.
- ↑ Sherlis, Juliya (2001). "Thickness of a piece of paper". in Elert, Glenn. https://hypertextbook.com/facts/2001/JuliaSherlis.shtml. Retrieved 2022-01-21.
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