我发布过一个在线单位换算工具, 主要用于换算量化计算和分子模拟中的一些常见单位, 特别是能量. 要在不同单位之间换算, 必然会涉及换算因子, 这些因子大多来源于一些基本的物理化学常数, 比如光速, 原子质量单位, 基本电荷等. CODATA一直在进行这些基本理化常数的评估与更新工作, 发布的数值算是权威来源. 简单而言, CODATA会收集新的实验测量数据, 评估其好坏, 对基本常数的影响, 并对涉及到的常数进行调整, 每隔4年发布新的常数值及其误差. 调整是综合考虑所有常数的, 这样才能保证整个系统的误差最小, 因为各个常数之间存在着非常多的约束关系.
最初开发在线单位换算工具时, 换算因子所用的基本常数来源于CODATA-2018. 根据CODATA的计划, 会在2022年发布这些基本常数的新版本. 然而2019年疫情开始了, CODATA的工作受到影响, 新数值的发布一直延期, 直到最近才发布了CODATA-2022.
考虑到有人会用到我的在线单位换算工具, 所以我就将换算因子更新到了CODATA-2022. 如果大家在使用时遇到任何问题/错误, 烦请留言告知.
目前的国际单位制中, 一些基本常数已定义为精确值
<table id='tab-0'><caption>具有精确值的基本常数</caption><tr> <th rowspan="1" colspan="1" style="text-align:center;">物理量</th> <th rowspan="1" colspan="1" style="text-align:center;">符号</th> <th rowspan="1" colspan="1" style="text-align:center;">精确值</th> <th rowspan="1" colspan="1" style="text-align:center;">单位</th> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">真空光速/速度自然单位</td> <td rowspan="1" colspan="1" style="text-align:center;">c</td> <td rowspan="1" colspan="1" style="text-align:center;">299792458</td> <td rowspan="1" colspan="1" style="text-align:center;">m/s</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">基元电荷/电荷原子单位</td> <td rowspan="1" colspan="1" style="text-align:center;">e</td> <td rowspan="1" colspan="1" style="text-align:center;">1.602176634E-19</td> <td rowspan="1" colspan="1" style="text-align:center;">C</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">普朗克常数</td> <td rowspan="1" colspan="1" style="text-align:center;">h</td> <td rowspan="1" colspan="1" style="text-align:center;">6.62607015E-34</td> <td rowspan="1" colspan="1" style="text-align:center;">Js</td> </tr> <tr> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">阿伏加德罗常数/每摩尔数目</td> <td rowspan="1" colspan="1" style="text-align:center;">Na</td> <td rowspan="1" colspan="1" style="text-align:center;">6.02214076E23</td> <td rowspan="1" colspan="1" style="text-align:center;">1/mol</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">玻尔兹曼常数</td> <td rowspan="1" colspan="1" style="text-align:center;">kb</td> <td rowspan="1" colspan="1" style="text-align:center;">1.380649E-23</td> <td rowspan="1" colspan="1" style="text-align:center;">J/K</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">标准压力</td> <td rowspan="1" colspan="1" style="text-align:center;">Po</td> <td rowspan="1" colspan="1" style="text-align:center;">100000</td> <td rowspan="1" colspan="1" style="text-align:center;">Pa</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">标准大气压</td> <td rowspan="1" colspan="1" style="text-align:center;">atm</td> <td rowspan="1" colspan="1" style="text-align:center;">101325</td> <td rowspan="1" colspan="1" style="text-align:center;">Pa</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">标准重力加速度</td> <td rowspan="1" colspan="1" style="text-align:center;">g</td> <td rowspan="1" colspan="1" style="text-align:center;">9.80665</td> <td rowspan="1" colspan="1" style="text-align:center;">kg/s2</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">Cs-133 超精细跃迁频率</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">9192631770</td> <td rowspan="1" colspan="1" style="text-align:center;">Hz</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">发光效能</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">683</td> <td rowspan="1" colspan="1" style="text-align:center;">lm/W</td> </tr> <tr> <td rowspan="1" colspan="4" style="text-align:center;">常用化学常数</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">标准温度</td> <td rowspan="1" colspan="1" style="text-align:center;">To</td> <td rowspan="1" colspan="1" style="text-align:center;">298.15</td> <td rowspan="1" colspan="1" style="text-align:center;">K</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">0摄氏度</td> <td rowspan="1" colspan="1" style="text-align:center;">T0</td> <td rowspan="1" colspan="1" style="text-align:center;">273.15</td> <td rowspan="1" colspan="1" style="text-align:center;">K</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">卡焦互换</td> <td rowspan="1" colspan="1" style="text-align:center;">cal2J</td> <td rowspan="1" colspan="1" style="text-align:center;">4.184</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">焦卡互换</td> <td rowspan="1" colspan="1" style="text-align:center;">J2cal</td> <td rowspan="1" colspan="1" style="text-align:center;">1/cal2J</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">纳米</td> <td rowspan="1" colspan="1" style="text-align:center;">nm</td> <td rowspan="1" colspan="1" style="text-align:center;">1E-9</td> <td rowspan="1" colspan="1" style="text-align:center;">m</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">埃</td> <td rowspan="1" colspan="1" style="text-align:center;">Å, A, Ang</td> <td rowspan="1" colspan="1" style="text-align:center;">1E-10</td> <td rowspan="1" colspan="1" style="text-align:center;">m</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">德拜</td> <td rowspan="1" colspan="1" style="text-align:center;">debye</td> <td rowspan="1" colspan="1" style="text-align:center;">1E-21/c</td> <td rowspan="1" colspan="1" style="text-align:center;">Cm</td> </tr> </table><table id='tab-1'><caption>具有精确值的导出常数</caption><tr> <th rowspan="1" colspan="1" style="text-align:center;">物理量</th> <th rowspan="1" colspan="1" style="text-align:center;">符号</th> <th rowspan="1" colspan="1" style="text-align:center;">表达式</th> <th rowspan="1" colspan="1" style="text-align:center;">精确值</th> <th rowspan="1" colspan="1" style="text-align:center;">单位</th> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">摩尔气体常数</td> <td rowspan="1" colspan="1" style="text-align:center;">R</td> <td rowspan="1" colspan="1" style="text-align:center;">Na*kb</td> <td rowspan="1" colspan="1" style="text-align:center;">8.314462618...</td> <td rowspan="1" colspan="1" style="text-align:center;">J/mol-K</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">理想气体摩尔体积<br>(273.15 K, 100 kPa)</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">(R*T0)/Po</td> <td rowspan="1" colspan="1" style="text-align:center;">22.71095464... e-3</td> <td rowspan="1" colspan="1" style="text-align:center;">m³/mol</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">理想气体摩尔体积<br>(273.15 K, 101.325 kPa)</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">(R*T0)/atm</td> <td rowspan="1" colspan="1" style="text-align:center;">22.41396954... e-3</td> <td rowspan="1" colspan="1" style="text-align:center;">m³/mol</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">洛施米特常数<br>(273.15 K, 100 kPa)</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">Po/(kb*T0)</td> <td rowspan="1" colspan="1" style="text-align:center;">2.651645804... e25</td> <td rowspan="1" colspan="1" style="text-align:center;">1/m³</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">洛施米特常数<br>(273.15 K, 101.325 kPa)</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">atm/(kb*T0)</td> <td rowspan="1" colspan="1" style="text-align:center;">2.686780111... e25</td> <td rowspan="1" colspan="1" style="text-align:center;">1/m³</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">法拉第常数</td> <td rowspan="1" colspan="1" style="text-align:center;">F</td> <td rowspan="1" colspan="1" style="text-align:center;">e*Na</td> <td rowspan="1" colspan="1" style="text-align:center;">96485.33212...</td> <td rowspan="1" colspan="1" style="text-align:center;">C/mol</td> </tr> <tr> <td rowspan="1" colspan="7" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">摩尔普朗克常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">Na*h</td> <td rowspan="1" colspan="1" style="text-align:center;">3.990312712... e-10</td> <td rowspan="1" colspan="1" style="text-align:center;">J/mol-Hz</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">普朗克常数, 单位eV/Hz</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h/e</td> <td rowspan="1" colspan="1" style="text-align:center;">4.135667696... e-15</td> <td rowspan="1" colspan="1" style="text-align:center;">eV/Hz</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">约化普朗克常数<br>作用量原子单位<br>作用量自然单位</td> <td rowspan="1" colspan="1" style="text-align:center;">ℏ hbar</td> <td rowspan="1" colspan="1" style="text-align:center;">h/(2*pi)</td> <td rowspan="1" colspan="1" style="text-align:center;">1.054571817... e-34</td> <td rowspan="1" colspan="1" style="text-align:center;">Js</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">约化普朗克常数, 单位eVs</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">hbar/e</td> <td rowspan="1" colspan="1" style="text-align:center;">6.582119569... e-16</td> <td rowspan="1" colspan="1" style="text-align:center;">eV s</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">ℏc, 单位MeV fm</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">hbar*c/e/1E6/1E-15</td> <td rowspan="1" colspan="1" style="text-align:center;">197.3269804...</td> <td rowspan="1" colspan="1" style="text-align:left;">MeV fm</td> </tr> <tr> <td rowspan="1" colspan="7" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">黑体第一辐射常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">2*pi*h*c<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">3.741771852... e-16</td> <td rowspan="1" colspan="1" style="text-align:center;">W m²</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">黑体第一辐射常数(辐射出射度)</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">2*h*c<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">1.191042972... e-16</td> <td rowspan="1" colspan="1" style="text-align:center;">W m²/sr</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">黑体第二辐射常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h*c/kb</td> <td rowspan="1" colspan="1" style="text-align:center;">1.438776877... e-2</td> <td rowspan="1" colspan="1" style="text-align:center;">m K</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">斯特藩-玻尔兹曼常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">pi<sup>2</sup> *kb<sup>4</sup> /(60*hbar<sup>3</sup> *c<sup>2</sup>)</td> <td rowspan="1" colspan="1" style="text-align:center;">5.670374419... e-8</td> <td rowspan="1" colspan="1" style="text-align:center;">W/m²-K⁴</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">维恩频率位移常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h*c/(kb*(3+W0(-3*exp(-3))))</td> <td rowspan="1" colspan="1" style="text-align:center;">5.878925757... e10</td> <td rowspan="1" colspan="1" style="text-align:center;">Hz/K</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">维恩波长位移常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h*c/(kb*(5+W0(-5*exp(-5))))</td> <td rowspan="1" colspan="1" style="text-align:center;">2.897771955... e-3</td> <td rowspan="1" colspan="1" style="text-align:center;">m K</td> </tr> <tr> <td rowspan="1" colspan="7" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">基元电荷与约化普朗克常数比值</td> <td rowspan="1" colspan="1" style="text-align:right;">e/ℏ</td> <td rowspan="1" colspan="1" style="text-align:center;">e/hbar</td> <td rowspan="1" colspan="1" style="text-align:center;">1.519267447... e15</td> <td rowspan="1" colspan="1" style="text-align:center;">A/J</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">约瑟夫森常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">2*e/h</td> <td rowspan="1" colspan="1" style="text-align:center;">483597.8484... e9</td> <td rowspan="1" colspan="1" style="text-align:center;">Hz/V</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">约瑟夫森常数约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">483597.9 e9</td> <td rowspan="1" colspan="1" style="text-align:center;">Hz/V</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">磁通量量子</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h/(2*e)</td> <td rowspan="1" colspan="1" style="text-align:center;">2.067833848... e-15</td> <td rowspan="1" colspan="1" style="text-align:center;">Wb</td> </tr> <tr> <td rowspan="1" colspan="6" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">冯·克利青常数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h/e<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">25812.80745...</td> <td rowspan="1" colspan="1" style="text-align:center;">ohm</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">冯·克利青常数 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">25812.807</td> <td rowspan="1" colspan="1" style="text-align:center;">ohm</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">2*e<sup>2</sup>/h</td> <td rowspan="1" colspan="1" style="text-align:center;">7.748091729... e-5</td> <td rowspan="1" colspan="1" style="text-align:center;">S</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子倒数</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">h/(2*e<sup>2</sup>)</td> <td rowspan="1" colspan="1" style="text-align:center;">12906.40372...</td> <td rowspan="1" colspan="1" style="text-align:center;">ohm</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 ampere-90 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">1.00000008887...</td> <td rowspan="1" colspan="1" style="text-align:center;">A</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 coulomb-90约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">1.00000008887...</td> <td rowspan="1" colspan="1" style="text-align:center;">C</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 farad-90 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">0.99999998220...</td> <td rowspan="1" colspan="1" style="text-align:center;">F</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 henry-90 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">1.00000001779...</td> <td rowspan="1" colspan="1" style="text-align:center;">H</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 ohm-90 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">1.00000001779...</td> <td rowspan="1" colspan="1" style="text-align:center;">ohm</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 volt-90 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">1.00000010666...</td> <td rowspan="1" colspan="1" style="text-align:center;">V</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">电导量子 watt-90 约定值</td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;"></td> <td rowspan="1" colspan="1" style="text-align:center;">1.00000019553...</td> <td rowspan="1" colspan="1" style="text-align:center;">W</td> </tr> </table><table id='tab-2'><caption>具有精确值的能量换算因子</caption><tr> <th rowspan="1" colspan="1" style="text-align:center;">换算因子</th> <th rowspan="1" colspan="1" style="text-align:center;">表达式</th> <th rowspan="1" colspan="1" style="text-align:center;">精确值</th> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">eV2Hz</td> <td rowspan="1" colspan="1" style="text-align:center;">e/h</td> <td rowspan="1" colspan="1" style="text-align:center;">2.417989242e14</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">eV2invm</td> <td rowspan="1" colspan="1" style="text-align:center;">e/(h*c)</td> <td rowspan="1" colspan="1" style="text-align:center;">8.065543937e5</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">eV2J</td> <td rowspan="1" colspan="1" style="text-align:center;">e</td> <td rowspan="1" colspan="1" style="text-align:center;">1.602176634e-19</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">eV2K</td> <td rowspan="1" colspan="1" style="text-align:center;">e/kb</td> <td rowspan="1" colspan="1" style="text-align:center;">1.160451812e4</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">eV2kg</td> <td rowspan="1" colspan="1" style="text-align:center;">e/c<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">1.782661921e-36</td> </tr> <tr> <td rowspan="1" colspan="4" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">Hz2eV</td> <td rowspan="1" colspan="1" style="text-align:center;">h/e</td> <td rowspan="1" colspan="1" style="text-align:center;">4.135667696e-15</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">Hz2invm</td> <td rowspan="1" colspan="1" style="text-align:center;">1/c</td> <td rowspan="1" colspan="1" style="text-align:center;">3.335640951e-9</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">Hz2J</td> <td rowspan="1" colspan="1" style="text-align:center;">h</td> <td rowspan="1" colspan="1" style="text-align:center;">6.62607015e-34</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">Hz2K</td> <td rowspan="1" colspan="1" style="text-align:center;">h/kb</td> <td rowspan="1" colspan="1" style="text-align:center;">4.799243073e-11</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">Hz2kg</td> <td rowspan="1" colspan="1" style="text-align:center;">h/c<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">7.372497323e-51</td> </tr> <tr> <td rowspan="1" colspan="4" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">invm2eV</td> <td rowspan="1" colspan="1" style="text-align:center;">h*c/e</td> <td rowspan="1" colspan="1" style="text-align:center;">1.239841984e-6</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">invm2Hz</td> <td rowspan="1" colspan="1" style="text-align:center;">c</td> <td rowspan="1" colspan="1" style="text-align:center;">299792458</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">invm2J</td> <td rowspan="1" colspan="1" style="text-align:center;">h*c</td> <td rowspan="1" colspan="1" style="text-align:center;">1.986445857e-25</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">invm2K</td> <td rowspan="1" colspan="1" style="text-align:center;">h*c/kb</td> <td rowspan="1" colspan="1" style="text-align:center;">1.438776877e-2</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">invm2kg</td> <td rowspan="1" colspan="1" style="text-align:center;">h/c</td> <td rowspan="1" colspan="1" style="text-align:center;">2.210219094e-42</td> </tr> <tr> <td rowspan="1" colspan="4" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">J2eV</td> <td rowspan="1" colspan="1" style="text-align:center;">1/e</td> <td rowspan="1" colspan="1" style="text-align:center;">6.241509074e18</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">J2Hz</td> <td rowspan="1" colspan="1" style="text-align:center;">1/h</td> <td rowspan="1" colspan="1" style="text-align:center;">1.509190179e33</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">J2invm</td> <td rowspan="1" colspan="1" style="text-align:center;">1/(h*c)</td> <td rowspan="1" colspan="1" style="text-align:center;">5.034116567e24</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">J2K</td> <td rowspan="1" colspan="1" style="text-align:center;">1/kb</td> <td rowspan="1" colspan="1" style="text-align:center;">7.242970516e22</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">J2kg</td> <td rowspan="1" colspan="1" style="text-align:center;">1/c<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">1.112650056e-17</td> </tr> <tr> <td rowspan="1" colspan="4" style="text-align:center;"></td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">K2eV</td> <td rowspan="1" colspan="1" style="text-align:center;">kb/e</td> <td rowspan="1" colspan="1" style="text-align:center;">8.617333262e-5</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">K2Hz</td> <td rowspan="1" colspan="1" style="text-align:center;">kb/h</td> <td rowspan="1" colspan="1" style="text-align:center;">2.083661912e10</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">K2invm</td> <td rowspan="1" colspan="1" style="text-align:center;">kb/(h*c)</td> <td rowspan="1" colspan="1" style="text-align:center;">69.50348004</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">K2J</td> <td rowspan="1" colspan="1" style="text-align:center;">kb</td> <td rowspan="1" colspan="1" style="text-align:center;">1.380649e-23</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">K2kg</td> <td rowspan="1" colspan="1" style="text-align:center;">kb/c²</td> <td rowspan="1" colspan="1" style="text-align:center;">1.536179187e-40</td> </tr> <tr> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">kg2eV</td> <td rowspan="1" colspan="1" style="text-align:center;">c<sup>2</sup>/e</td> <td rowspan="1" colspan="1" style="text-align:center;">5.609588603e35</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">kg2Hz</td> <td rowspan="1" colspan="1" style="text-align:center;">c<sup>2</sup>/h</td> <td rowspan="1" colspan="1" style="text-align:center;">1.356392489e50</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">kg2invm</td> <td rowspan="1" colspan="1" style="text-align:center;">c/h</td> <td rowspan="1" colspan="1" style="text-align:center;">4.524438335e41</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">kg2J</td> <td rowspan="1" colspan="1" style="text-align:center;">c<sup>2</sup></td> <td rowspan="1" colspan="1" style="text-align:center;">8.987551787e16</td> </tr> <tr> <td rowspan="1" colspan="1" style="text-align:center;">kg2K</td> <td rowspan="1" colspan="1" style="text-align:center;">c<sup>2</sup>/kb</td> <td rowspan="1" colspan="1" style="text-align:center;">6.509657260e39</td> </tr> </table>目前支持的物理量有: 长度 质量 时间 能量 力 压强 浓度 密度 VDW参数. 这些都是我在工作中常用到的. 默认是能量, 因为这是最常用的.
输入框中可以输入任何合法的表达式, 工具会求值表达式, 显示结果, 并换算为其他输入框对应的单位. 因此, 这个工具也可以作为简单的计算器使用.