Si (length)
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Si (simplified Chinese: 丝; traditional Chinese: 絲; pinyin: 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.
Present law on Chinese length units
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.
| Pinyin | Character | Relative value | Metric value | Imperial value | Notes |
|---|---|---|---|---|---|
| sī | 絲 (T) or 丝 (S) | 1⁄100 000 | 3+1⁄3 μm | 0.000131 in | |
| háo | 毫 | 1⁄10 000 | 33+1⁄3 μm | 0.00131 in | Chinese mil |
| lí | 釐 (T) or 厘 (S) | 1⁄1000 | 1⁄3 mm | 0.0131 in | Chinese calibre |
| fēn | 市分 | 1⁄100 | 3+1⁄3 mm | 0.1312 in | Chinese line |
| cùn | 市寸 | 1⁄10 | 3+1⁄3 cm | 1.312 in | Chinese inch |
| chǐ | 市尺 | 1 | 33+1⁄3 cm | 13.12 in | Chinese foot |
| zhàng | 市丈 | 10 | 3+1⁄3 m | 3.645 yd | Chinese yard |
| yǐn | 引 | 100 | 33+1⁄3 m | 36.45 yd | Chinese chain |
| lǐ | 市里 | 1500 | 500 m | 546.8 yd | Chinese mile. |
Metric length units
These units are based on the metric system. The Chinese word for metre is 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.
| Pinyin | Character | Relative value | Metric value | Imperial value | Notes |
|---|---|---|---|---|---|
| hū | 忽 | 1⁄1000000 | 1 μm | Authorized name: 微米 | |
| sī | 絲 (T) or 丝 (S) | 1⁄100000 | 10 μm | Authorized name: 忽米 | |
| háo | 毫 | 1⁄10000 | 100 μm | Authorized name: 絲米 (T) or 丝米 (S) | |
| lí | 釐 (T) or 厘 (S) | 1⁄1000 | 1 mm | Authorized name: 毫米 | |
| fēn | 公分 | 1⁄100 | 10 mm | Authorized name: 釐米(T) or 厘米(S) | |
| cùn | 公寸 | 1⁄10 | 100 mm | Authorized name: 分米 | |
| chǐ | 公尺 | 1 | 1 m | Authorized name: 米 | |
| Zhàng | 公丈 | 10 | 10 m | Authorized name: 十米 | |
| yǐn | 公引 | 100 | 100 m | Authorized name: 百米 | |
| lǐ | 公里 | 1000 | 1000 m | this li is not the small li above, which has a different character and tone |
Compounds
- 絲毫 (sīháo)
- 一絲一毫 (yīsīyīháo)
- 一絲不苟
- 一絲 希望／一丝 希望 ― yī sī xīwàng ― a glimmer of hope.