what unit of length would you generally use to measure a typical human cell?

Unit of Length: i millionth of a metre

Micrometre
A 6 μm diameter carbon filament higher up a 50 μm diameter human being hair
Full general information
Unit system	metric
Unit of	length
Symbol	μm
Conversions
1 μm in ...	... is equal to ...
SI units	10−6 m
Natural units	one.8897×ten4a 0
imperial/US units	3.2808×10−6 ft, 3.9370×ten−5 in

The micrometre (international spelling as used by the International Bureau of Weights and Measures;^[1] SI symbol: μm) or micrometer (American spelling), too commonly known as a micron, is an SI derived unit of length equalling 1×x⁻⁶ metre (SI standard prefix "micro-" = 10⁻⁶ ); that is, one millionth of a metre (or 1 thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).^[i]

The side by side smallest common SI unit of measurement is the nanometre, equivalent to one one-thousandth of a micrometre, or i billionth of a metre ( 0.000000 001 m).

The micrometre is a common unit of measurement for wavelengths of infrared radiation also as sizes of biological cells and leaner,^[ane] and for grading wool by the diameter of the fibres.^[2] The width of a single human hair ranges from approximately 20 to 200 μm. The longest human chromosome, chromosome ane, is approximately 10 μm in length.

Examples [edit]

Between ane μm and 10 μm:

• one–10 μm – length of a typical bacterium
• x μm – Size of fungal hyphae
• v μm – length of a typical human spermatozoon's head^[3]
• 3–eight μm – width of strand of spider web silk^[4]
• nearly ten μm – size of a fog, mist, or cloud water droplet

Between 10 μm and 100 μm:

• virtually x–12 μm – thickness of plastic wrap (cling wrap)
• x to 55 μm – width of wool fibre^[five]
• 17 to 181 μm – diameter of human hair^[half-dozen]
• 70 to 180 μm – thickness of paper

SI standardization [edit]

The term micron and the symbol μ were officially accepted for use in isolation to denote the micrometre in 1879, but officially revoked by the International Organization of Units (SI) in 1967.^[7] This became necessary because the older usage was incompatible with the official adoption of the unit prefix micro-, denoted μ, during the creation of the SI in 1960.

In the SI, the systematic name micrometre became the official proper noun of the unit of measurement, and μm became the official unit symbol.

Additionally, in American English, the utilize of "micron" helps differentiate the unit from the micrometer, a measuring device, considering the unit's name in mainstream American spelling is a homograph of the device's proper name. In spoken English, they may be distinguished by pronunciation, every bit the name of the measuring device is frequently stressed on the second syllable ( my-KROM-information technology-ər), whereas the systematic pronunciation of the unit name, in accord with the convention for pronouncing SI units in English, places the stress on the kickoff syllable ( MY-kroh-meet-ər).

The plural of micron is normally microns, though micra was occasionally used before 1950.^{[eight] [nine] [10]}

Symbol [edit]

The official symbol for the SI prefix micro- is a Greek lowercase mu.^[11] In Unicode, there is also a micro sign with the code point U+00B5 (µ), distinct from the lawmaking point U+03BC (μ) of the Greek alphabetic character lowercase mu. According to the Unicode Consortium, the Greek letter character is preferred,^[12] but implementations must recognize the micro sign every bit well. Most fonts utilize the same glyph for the two characters.

Meet too [edit]

• Metric prefix
• Metric system
• Orders of magnitude (length)
• Wool measurement

Notes and references [edit]

1. ^ ^{a b c} "micrometre". Encyclopædia Britannica Online . Retrieved 18 May 2014.
2. ^ "Wool Fibre". NSW Department of Teaching and Communities. Archived from the original (Word Document download) on 17 June 2016. Retrieved 18 May 2014.
3. ^ Smith, D.J.; Gaffney, Eastward.A.; Blake, J.R.; Kirkman-Brown, J.C. (25 Feb 2009). "Human sperm accumulation virtually surfaces: a simulation study" (PDF). Journal of Fluid Mechanics. Cambridge University Press. 621: 295. Bibcode:2009JFM...621..289S. doi:ten.1017/S0022112008004953. S2CID 3942426. Archived from the original (PDF) on half-dozen November 2013.
4. ^ Ramel, Gordon. "Spider Silk". Archived from the original on 4 December 2008. Retrieved xiv December 2008. A typical strand of garden spider silk has a diameter of near 0.003 mm ... Dragline silk (well-nigh .00032 inch (.008 mm) in Nephila)
5. ^ "Fibreshape applications". IST - Innovative Sintering Technologies Ltd. Retrieved four Dec 2008. Histogram of Cobweb Thickness [micrometre]
6. ^ The diameter of human hair ranges from 17 to 181 μm. Ley, Brian (1999). Elert, Glenn (ed.). "Diameter of a human hair". The Physics Factbook . Retrieved 8 December 2018.
7. ^ BIPM - Resolution 7 of the 13th CGPM 1967/68), "Abrogation of before decisions (micron, new candle.)"
8. ^ Proceedings of the Royal Guild of Queensland. Part I. Vol. Nineteen. H. Pole & Co. 1907 – via Google Books.
9. ^ Bigalow, Edward Fuller; Agassiz Clan (1905). The Observer. Vol. 7–8 – via Google Books.
10. ^ ten micra/x microns (Start at 1885; before that, the word "micron", singular or plural, was rare)
11. ^ "Prefixes of the International System of Units". International Agency of Weights and Measures. Archived from the original on 23 May 2018. Retrieved nine May 2016.
12. ^ Beeton, Barbara; Freytag, Asmus; Sargent, Murray III (30 May 2017). "Unicode Technical Report #25". Unicode Technical Reports. Unicode Consortium. p. 11.

External links [edit]

• The dictionary definition of micrometre at Wiktionary

brownchaketherver.blogspot.com

Source: https://en.wikipedia.org/wiki/Micrometre

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