# 单位换算

（重定向自单位转换

## 系数抵消

${\displaystyle {\frac {\mathrm {10~{\cancel {mi}}} }{\mathrm {1~{\cancel {h}}} }}\times {\frac {\mathrm {1609.344~m} }{\mathrm {1~{\cancel {mi}}} }}\times {\frac {\mathrm {1~{\cancel {h}}} }{\mathrm {3600~s} }}=\mathrm {4.4704~{\frac {m}{s}}} .}$

NOx浓度
= 百万分比10的体积 = 10 ppmv = 10体积单位/106体积单位
NOx摩尔质量
= 46 kg/kmol = 46 g/mol

= 20立方米每分钟 = 20 m3/min

${\displaystyle {\frac {1000\ {\ce {g\ NO}}_{x}}{1{\cancel {{\ce {kg\ NO}}_{x}}}}}\times {\frac {46\ {\cancel {{\ce {kg\ NO}}_{x}}}}{1\ {\cancel {{\ce {kmol\ NO}}_{x}}}}}\times {\frac {1\ {\cancel {{\ce {kmol\ NO}}_{x}}}}{22.414\ {\cancel {{\ce {m}}^{3}\ {\ce {NO}}_{x}}}}}\times {\frac {10\ {\cancel {{\ce {m}}^{3}\ {\ce {NO}}_{x}}}}{10^{6}\ {\cancel {{\ce {m}}^{3}\ {\ce {gas}}}}}}\times {\frac {20\ {\cancel {{\ce {m}}^{3}\ {\ce {gas}}}}}{1\ {\cancel {\ce {minute}}}}}\times {\frac {60\ {\cancel {\ce {minute}}}}{1\ {\ce {hour}}}}=24.63\ {\frac {{\ce {g\ NO}}_{x}}{\ce {hour}}}}$

### 复核涉及因次的方程式

• 压强（P）以帕斯卡（Pa）表示
• 体积（V）以立方米（m3）表示
• 物质的量（n）以摩尔（mol）表示
• 氣體常數R）是8.3145 Pa⋅m3/(mol⋅K)
• 温度T以开尔文（K）表示

${\displaystyle \mathrm {Pa{\cdot }m^{3}} ={\frac {\cancel {\mathrm {mol} }}{1}}\times {\frac {\mathrm {Pa{\cdot }m^{3}} }{{\cancel {\mathrm {mol} }}\ {\cancel {\mathrm {K} }}}}\times {\frac {\cancel {\mathrm {K} }}{1}}}$

### 限制

T[C] = (T[F] − 32) × 5/9.

T[F] = (T[C] × 9/5) + 32.

## 涉及非SI单位的计算

${\displaystyle \xi ={\frac {\hbar }{\sqrt {2m\mu }}}\,.}$

### 计算初步系数

${\displaystyle \xi ={\frac {\hbar }{\sqrt {2m\mu }}}=15.574\,\mathrm {\mu m} \,,}$

## 注释和参考文献

1. ^ Goldberg, David. Fundamentals of Chemistry 5th. McGraw-Hill. 2006. ISBN 978-0-07-322104-5.
2. ^ Ogden, James. The Handbook of Chemical Engineering. Research & Education Association. 1999. ISBN 978-0-87891-982-6.
3. ^ Dimensional Analysis or the Factor Label Method. Mr Kent's Chemistry Page. [2023-05-02]. （原始内容存档于2021-04-10）.
4. ^ Identity property of multiplication. [2015-09-09]. （原始内容存档于2023-05-05）.
5. ^ Foot, C. J. Atomic physics. Oxford University Press. 2005. ISBN 978-0-19-850695-9 （英语）.