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OBSOLETE PHYSICAL CONSTANTS 程序包 教程
As of version 9.0, physical constant functionality is built into Mathematica 
Physical Constants Package
In addition to providing a comprehensive environment for calculations and a programming language, Mathematica is also a system for representing and presenting scientific and technical knowledge. Certain packages are included with Mathematica to provide easy access to commonly used scientific data, such as the value of physical constants and conversion factors for various systems of units.
| SpeedOfLight | the speed of light is 299792458 Meter/Second |
| AvogadroConstant | Avogadro's constant is approximately 6.02214199×1023Mole^-1 |
| ElectronMass | the mass of an electron is approximately 9.10938188×10-31 Kilogram |
| FineStructureConstant | the fine structure constant is approximately  |
| EarthMass | the mass of the earth is approximately 5.9742×1024 Kilogram |
| AccelerationDueToGravity | the acceleration due to gravity is 9.80665 Meter/Second2 |
Some common physical constants.
| In[1]:= |
| In[2]:= |
| Out[2]= |  |
| In[3]:= |
| Out[3]= |  |
