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Category: engineering constants
Reference Dataset
Fundamental Physical & Engineering Constants Table
Standard values for acceleration of gravity, universal gas constant, Stefan-Boltzmann, speed of light, and water density.
Overview & Scope
Fundamental physical constants form the basis of all engineering formulations. Standard values must remain consistent across calculators to prevent roundoff errors.
Technical Sizing Values
The table below specifies values, symbols, and SI/Imperial units for standard mechanical engineering constants.
| Constant Name | Symbol | Value (SI Units) | SI Unit | Value (Imperial Units) | Imperial Unit | Description |
|---|---|---|---|---|---|---|
| Acceleration of Gravity | g | 9.80665 | m/s² | 32.174 | ft/s² | Standard gravitational acceleration at sea level. |
| Universal Gas Constant | R | 8.31446 | J/(mol·K) | 1545.3 | ft·lb/(lb-mol·°R) | Constant in the ideal gas equation of state. |
| Speed of Light in Vacuum | c | 299792458 | m/s | 983571056 | ft/s | Speed of electromagnetic waves in vacuum. |
| Standard Density of Water | ρ_w | 1000 | kg/m³ | 62.428 | lb/ft³ | Density of pure water at 4°C. |
| Stefan-Boltzmann Constant | σ | 5.67037e-8 | W/(m²·K⁴) | 1.714e-9 | BTU/(hr·ft²·°R⁴) | Proportionality constant in blackbody radiation law. |
Engineering Notes & Best Practices
- •Standard gravity g is defined at sea level at 45° latitude.
- •Stefan-Boltzmann constant is central to thermal radiation heat transfer calculations.
- •The universal gas constant R relates thermodynamic state parameters for ideal gases.
Dataset Citations & References
CODATA Recommended Values of the Fundamental Physical Constants
Public domain source and standard catalog reference parameters.