The constants and physical constants used by AutoChem are given in the table below. References can be obtained by clicking on the variable name.
| π (pi) | 3.141 592 653 589 793 238 462 643 383 279 502 884 197 |
| Molar gas constant , R | 8.314 472 (15) J mol -1 K -1 |
| Mean molar mass of dry air , m | 28.964 g mole |
| Molar gas constant for air , R/m | 287.058 3 |
| Mean surface pressure , Po | 1013.25 mb |
| Specific heat capacity of dry air , Cp | 1005.7 J kg -1 k -1 |
| Mean radius of the earth , Re | 6371.01 km |
| Boltzmann Constant , k | 1.380 650 5(24) x 10 -23 J K -1 |
| Unified atomic mass unit , u | 1.660 538 86(28) x 10 -27 kg |
| Avogadro constant , Na | 6.022 141 5(10) x 10 23 mol -1 |
| Standard acceleration of gravity , g | 9.806 65 m s -2 |
Reaction Databases
Several sources of online kinetic data are available. These include:
- NIST Chemical Kinetics Database on the Web.
- IUPAC Gas Kinetic Data Evaluation
- JPL Kinetic and Photochemical data for stratospheric modelling (JPL '00)
Unit Conversions