Convert Picofarads per centimetre to Femtofarads per metre
Convert Picofarads per centimetre (pF/cm) to Femtofarads per metre (fF/m) instantly and accurately.
Conversion Formula
fF/m = pF/cm × 100000
About Picofarads per centimetre
The picofarad per centimetre (pF/cm) equals 10⁻¹⁰ F/m = 100 pF/m, used for transmission-line capacitance per unit length in RF engineering. A standard 50 Ω air-dielectric coaxial line has capacitance per unit length ≈67 pF/m ≈0.67 pF/cm; PTFE coax gives ≈0.9 pF/cm. RF substrate characterisation often quotes pF/cm. 1 pF/cm = 10⁻¹⁰ F/m.
About Femtofarads per metre
The femtofarad per metre (fF/m) equals 10⁻¹⁵ F/m, the smallest practical permittivity scale. Permittivity of near-perfect vacuum regions at sub-pF/m levels, noise-floor permittivity in cryogenic microwave resonators, and modelled permittivity of hypothetical near-zero-index metamaterial layers all span the fF/m range. 1 fF/m = 10⁻¹⁵ F/m = 10⁻³ pF/m.
Quick Reference Table
| Picofarads per centimetre (pF/cm) | Femtofarads per metre (fF/m) |
|---|---|
| 1 pF/cm | 100000 fF/m |
| 2 pF/cm | 200000 fF/m |
| 5 pF/cm | 500000 fF/m |
| 10 pF/cm | 1000000 fF/m |
| 25 pF/cm | 2500000 fF/m |
| 50 pF/cm | 5000000 fF/m |
| 100 pF/cm | 10000000 fF/m |