Convert Henries per metre to Femtohenries per metre
Convert Henries per metre (H/m) to Femtohenries per metre (fH/m) instantly and accurately.
Conversion Formula
fH/m = H/m × 1000000000000000
About Henries per metre
The henry per metre (H/m) is the SI coherent unit of absolute magnetic permeability, equal to 1 kg·m·s⁻²·A⁻². Only the highest-permeability alloys reach this scale: annealed Mu-metal achieves µ ≈ 0.1-0.4 H/m (µᵣ up to 300 000); Supermalloy under optimal conditions approaches µ ≈ 1 H/m (µᵣ ≈ 10⁶). 1 H/m ≈ 7.96 × 10⁵ µ₀.
About Femtohenries per metre
The femtohenry per metre (fH/m) equals 10⁻¹⁵ H/m. A theoretical subunit used in precision electromagnetic metrology. Even the extreme diamagnet bismuth (µᵣ = 0.999834) departs from µ₀ by about −207 nH/m - far above the fH/m scale. Primarily a reference unit for quantum EM standard calculations. 1 fH/m = 10⁻¹⁵ H/m.
Quick Reference Table
| Henries per metre (H/m) | Femtohenries per metre (fH/m) |
|---|---|
| 1 H/m | 1 × 1015 fH/m |
| 2 H/m | 2 × 1015 fH/m |
| 5 H/m | 5 × 1015 fH/m |
| 10 H/m | 1 × 1016 fH/m |
| 25 H/m | 2.5 × 1016 fH/m |
| 50 H/m | 5 × 1016 fH/m |
| 100 H/m | 1 × 1017 fH/m |