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可并用单位

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可并用单位(英文:Non-SI units mentioned in the SI)是国际单位制(SI)有提及的单位[1],但没有给定精确定义。因为国际度量衡大会认为他们是标准单位的倍数且被人们广泛使用[2][3]

被接受的单位

名称 符号 物理量 换算
分钟 min 时间 1 min = 60 s
小时 h 时间 1 h = 60 min = 3600 s
d 时间 1 d = 24 h = 1440 min = 86400 s
天文单位 auAU[2][4] 长度 1 AU = 1.495978707×1011 (精确值)
° 平面角度 1° = (π / 180) rad
角分 平面角度 1′ = (1 / 60)° = (π / 10800) rad
角秒 平面角度 1″ = (1 / 60)′ = (1 / 3600)° = (π / 648000) rad
公顷 ha 面积 1 ha = 100 a = 10000 m2 = 1 hm2
lL 液体体积 1 L = 1 dm3 = 0.001 m3 = 1000 cm3
公吨 t 质量 1 t = 103 kg = 1 Mg
道尔顿 uDa 质量 1 Da = 1.66053906660(50)×10−27 kg
电子伏特 eV 能量 1 eV = 1.602176634×10−19 J(精确值)
奈培 Np 对数单位 1 Np = 1[5]
    level of a power quantity 1 Np = 1[6]
B 对数单位 1 B = ln(10)/2 Np = ln(10)/2[7]
    level of a power quantity
分贝 dB 对数单位 1 dB = 0.1 B [8]
    level of a power quantity

参考文献

  1. ^ 中国标准的国际单位 (PDF). [2016-04-13]. (原始内容存档 (PDF)于2017-01-11). 
  2. ^ 2.0 2.1 The International System of Units (SI) (PDF). SI brochure (9th edition). BIPM. 2019 [2019] [2020-05-28]. (原始内容存档 (PDF)于2020-07-26). 
  3. ^ Taylor, Barry N. (ed.). The International System of Units (SI) (PDF). Special Publication 330. Gaithersburg, Maryland: National Institute of Standards and Technology (NIST). 2001 [2016-03-20]. (原始内容存档 (PDF)于2016-06-03). 
  4. ^ Manuscript Preparation: AJ & ApJ Author Instructions. American Astronomical Society. [2015-06-15]. (原始内容存档于2016-02-21). 
  5. ^ LF = ln(F / F0) Np
  6. ^ LP = 12 ln(P / P0) Np
  7. ^ LF = 2 log10(F / F0) B
  8. ^ LP = log10(P / P0) B
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可并用单位
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