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Physical constants used across calculators.
Constants§
- COPPER_
MELTING_ POINT_ C - Copper melting point (°C) — used in Onderdonk fusing equation.
- COPPER_
RESISTIVITY_ OHM_ CM - Copper resistivity at 20°C (Ω·cm).
- COPPER_
TEMP_ COEFF - Copper temperature coefficient (1/°C).
- EPSILON_
0 - Permittivity of free space ε₀ (F/m).
- FOUR_
OVER_ PI - 4/π — geometric correction for coaxial/via capacitance.
- INCH_
TO_ CM - 1 inch in centimeters.
- KJ_
DISPERSION_ A - Kirschning-Jansen dispersion constant a.
- KJ_
DISPERSION_ B - Kirschning-Jansen dispersion constant b.
- MIL_
TO_ M - 1 mil in meters.
- MU_0
- Permeability of free space µ₀ (H/m).
- SPEED_
OF_ LIGHT_ IN_ NS - Speed of light in vacuum (in/ns) — convenience for transmission line calcs. Exact: 299_792_458 m/s × (1 in / 0.0254 m) × (1 s / 1e9 ns) = 11.80285…
- SPEED_
OF_ LIGHT_ MS - Speed of light in vacuum (m/s).