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Si (length)

{{Short description|Chinese unit of length}}

Si ({{zh|t=絲|s=丝 |p=sī}}) is a traditional Chinese unit of length. One si is equal to 1/10 of a hao, 1/100 000 of a chi, or 3+1⁄3 μm. In the field of engineering, one si equals 10 μm.{{Cite book |last=Language Institute |first=Chinese Academy of Social Sciences |title=新华字典 (Xinhua Dictionary)|publisher=The Commercial Press |year=2020 |isbn=978-7-100-17093-2 |edition=12th |location=Beijing |pages=458, 696 |language=Chinese}}https://en.wiktionary.org/wiki/絲

Present law on Chinese length units

File:ROC1929-02-20國民政府公報97.pdf

This law of length measurement was issued by the Chinese government in 1929, and has been effective since 1 January 1930. The base unit chi is defined to be 1/3 meter.{{Cite web|url=http://lis.ly.gov.tw/lghtml/lawstat/version2/01926/0192618020200.htm |archive-url=https://web.archive.org/web/20140425025351/http://lis.ly.gov.tw/lghtml/lawstat/version2/01926/0192618020200.htm |url-status=dead |archive-date=2014-04-25 |title=The Weights and Measures Act (1929) |publisher=Legislative Yuan }}{{Cite book |last=Language Institute |first=Chinese Academy of Social Sciences | title={{zhi|現代漢語詞典}} (Contemporary Chinese Dictionary) |publisher=Commercial Press |year=2016 |isbn=978-7-100-12450-8 |edition=7th |location=Beijing |language=zh|pages=1235, 1789}}《中华人民共和国国务院公报》1959年第16号（总号：180）第316页《統一公制計量單位中文名称方案》（"Gazette of the State Council of the People's Republic of China" No. 16, 1959 (Total No.: 180) p. 316 "Proposal for Unifying the Chinese Names of Metric Measurement Units" ）

class="wikitable"

|+ Table of Chinese length units effective since 1930

!Pinyin

!Character

!Relative value

!Metric value

!Imperial value

!Notes

align=center|sī

|align=right|{{lang|zh|絲 (T) or 丝 (S)}}

|align=right|{{frac|100 000}}

|align=right|{{frac|3|1|3}} μm

|align=right|{{val|0.000131|u=in}}

|align=left|

align=center|háo

|align=right|{{lang|zh|毫}}

|align=right|{{frac|10 000}}

|align=right|{{frac|33|1|3}} μm

|align=right|{{val|0.00131|u=in}}

|align=left|Chinese mil

align=center|lí

|align=right|{{lang|zh|釐}} (T) or {{lang|zh|厘}} (S)

|align=right|{{frac|1000}}

|align=right|{{frac|3}} mm

|align=right|0.0131 in

|align=left|Chinese calibre

align=center|fēn

|align=right|{{lang|zh-hant|市分}}

|align=right|{{frac|100}}

|align=right|{{frac|3|1|3}} mm

|align=right|0.1312 in

|align=left|Chinese line

align=center|cùn

|align=right|{{lang|zh|市寸}}

|align=right|{{frac|10}}

|align=right|{{frac|3|1|3}} cm

|align=right|1.312 in

|align=left|Chinese inch

align=center|chǐ

|align=right|{{lang|zh|市尺}}

|align=right|1

|align=right|{{frac|33|1|3}} cm

|align=right|13.12 in

|align=left|Chinese foot

align=center|zhàng

|align=right|{{lang|zh|市丈}}

|align=right|10

|align=right|{{frac|3|1|3}} m

|align=right|3.645 yd

|align=left|Chinese yard

align=center|yǐn

|align=right|{{lang|zh|引}}

|align=right|100

|align=right|{{frac|33|1|3}} m

|align=right|36.45 yd

|align=left|Chinese chain

align=center|lǐ

|align=right|{{lang|zh|市里}}

|align=right|1500

|align=right|500 m

|align=right|546.8 yd

|align=left|Chinese mile.

Metric length units

These units are based on the metric system. The Chinese word for metre is {{lang|zh|米}} mǐ, which can take the Chinese standard SI prefixes (for "kilo-", "centi-", etc.). In the engineering field, traditional units are rounded up to metric units.{{in lang|zh}} [http://www.gov.cn/zwgk/2011-11/09/content_1989016.htm 1981 Gazette of the State Council of the People's Republic of China] {{Webarchive|url=https://web.archive.org/web/20120111151047/http://www.gov.cn/zwgk/2011-11/09/content_1989016.htm |date=2012-01-11 }}, [http://www.gov.cn/gongbao/shuju/1981/gwyb198118.pdf No. 365] {{Webarchive|url=https://web.archive.org/web/20141104042737/http://www.gov.cn/gongbao/shuju/1981/gwyb198118.pdf |date=2014-11-04 }}, page 575, Table 7: SI prefixes{{cite web |url=https://www.bsmi.gov.tw/wSite/public/Attachment/f1698828903738.pdf |archive-url=https://web.archive.org/web/20240113153412/https://www.bsmi.gov.tw/wSite/public/Attachment/f1698828903738.pdf |archive-date=13 January 2024 |title=法定度量衡單位及前綴詞 |last= |first= |date=31 October 2023 |website=bsmi.gov.tw |publisher= |quote=}}

class="wikitable"

|+ Table of Chinese length units in engineering

!Pinyin

!Character

!Relative value

!Metric value

!Imperial value

!Notes

align=right

|align=center|hū

|{{lang|zh|忽}}

{{frac|{{val|1000000}}}}1 μm|align=left|Authorized name: {{lang|zh|微米}}
align=right

|align=center|sī

|{{lang|zh|絲}} (T) or {{lang|zh|丝}} (S)

{{frac|{{val|100000}}}}10 μm|align=left|Authorized name: {{lang|zh|忽米}}
align=right

|align=center|háo

|{{lang|zh|毫}}

{{frac|{{val|10000}}}}100 μm|align=left|Authorized name: {{lang|zh|絲米}} (T) or {{lang|zh|丝米}} (S)
align=right

|align=center|lí

|{{lang|zh|釐}} (T) or {{lang|zh|厘}} (S)

{{frac|1000}}1 mm|align=left|Authorized name: {{lang|zh|毫米}}
align=right

|align=center|fēn

|{{lang|zh|公分}}

{{frac|100}}10 mm|align=left|Authorized name: {{lang|zh|釐米}}(T) or {{lang|zh|厘米}}(S)
align=right

|align=center|cùn

|{{lang|zh|公寸}}

{{frac|10}}100 mm|align=left|Authorized name: {{lang|zh|分米}}
align=right

|align=center|chǐ

|{{lang|zh|公尺}}

11 m|align=left|Authorized name: {{lang|zh|米}}
align=right

|align=center|Zhàng

|{{lang|zh|公丈}}

1010 m|align=left|Authorized name: {{lang|zh|十米}}
align=right

|align=center|yǐn

|{{lang|zh|公引}}

100100 m|align=left|Authorized name: {{lang|zh|百米}}
align=right

|align=center|lǐ

|{{lang|zh|公里}}

10001000 m|align=left|this li is not the small li above,
which has a different character and tone

Compounds

  • 絲毫 (sīháo)
  • 一絲一毫 (yīsīyīháo){{cite web |title=《重編國語辭典修訂本》臺灣學術網路第六版 ("Revised Edition of the Chinese Dictionary" Taiwan Academic Network Sixth Edition) |publisher=中華民國教育部 (Ministry of Education of the Republic of China) |url=https://dict.revised.moe.edu.tw/dictView.jsp?ID=149838&q=1&word=%E4%B8%80%E7%B5%B2%E4%B8%80%E6%AF%AB}}
  • 一絲不苟
  • 一絲 希望／一丝 希望 ― yī sī xīwàng ― a glimmer of hope.

See also

References

{{reflist}}

Category:Units of length

Category:Customary units of measurement