GoldSim provides a number of constantsthat can be used in equations. The built-in constants are:
| Abbreviation | Definition | Units | Value |
| amu | Atomic mass unit | kg | 1.6605402e-027 |
| c | Speed of light | m/s | 299792458 |
| e | Base of natural logarithms | 2.71828182845905 | |
| ec | Elementary charge (electron) | s-amp | 1.60217733e-019 |
| Eps0 | Permittivity of vacuum | s4-amp2/kg-m3 | 8.85418781762039e-12 |
| ev | Electron-volt | kg-m2/s2 | 1.60217733e-019 |
| G | Gravitational constant | m3/kg-s2 | 6.67259e-011 |
| gee | Acceleration of gravity | m/s2 | 9.80665 |
| h | Planck’s constant | kg-m2/s | 6.6260755e-34 |
| HgDens | Density of mercury | kg/m3 | 13595.08 |
| k | Boltzmann constant | kg-m2/s2-K | 1.380658e-23 |
| me | Electron mass | kg | 9.1093897e-31 |
| mn | Neutron mass | kg | 1.6749286e-27 |
| mp | Proton mass | kg | 1.6726231e-27 |
| Mu0 | Permeability of vacuum | kg-m/s2-amp2 | 1.25663706143592e-06 |
| N | Avogadro’s constant | 1/mol | 6.0221367e+23 |
| pi | Pi | 3.14159265358979 | |
| R | Gas constant | kg-m2/s2-K-mol | 8.31451 |
| sigma | Stefan-Boltzmann constant | kg/s3-K4 | 5.67051e-008 |
| Stemp | Standard temperature | K | 273.15 |
| Vmol | Molar gas volume at STP | m3 | 0.0224140972760918 |
| WatDens | Density of water at STP | kg/m3 | 999.95 |
| WatWt | Unit weight of water at STP | kg/m2/s2 | 9806.16 |
Warning: If there is an element name which conflicts with (i.e., is identical to) a constant name, the element name always has precedence. Hence, if you type an expression such as 3*R, and an element named R exists in the same scope The portion of a model from which an element's output can be referenced. You cannot reference an element in a different scope unless that output is specifically exposed., GoldSim will try to create a link to the element rather than using the built-in constant R, even if the element's dimensions An output attribute for an element that defines the dimensionality (in terms of Length, Time and other fundamental dimensions) of the output. are incompatible (such that the expression becomes invalid).