Convert Femtocoulombs per square metre to Coulombs per square metre
Convert Femtocoulombs per square metre (fC/m²) to Coulombs per square metre (C/m²) instantly and accurately.
Conversion Formula
C/m² = fC/m² × 1.000000000e-15
About Femtocoulombs per square metre
The femtocoulomb per square metre (fC/m²) equals 10⁻¹⁵ C/m², arising in scanning Kelvin probe measurements of oxide fixed charge. MOS interface state densities of 10¹ charges/cm² correspond to about 0.16 fC/m²; fixed charge in high-k gate dielectrics and SiO₂/Si interfaces is typically 10-100 fC/m². 1 fC/m² = 10⁻¹⁵ C/m² = 10⁻³ pC/m².
About Coulombs per square metre
The coulomb per square metre (C/m²) is the SI coherent unit of surface charge density, equal to 1 A·s·m⁻². A parallel-plate capacitor with 1 C/m² on each plate produces a gap field of 1/ε₀ ≈ 113 GV/m; realistic capacitor plate densities are 10-100 µC/m²; charge density on a sphere at electrical breakdown of air is about 27 µC/m². 1 C/m² = 10³ mC/m² = 10⁶ µC/m².
Quick Reference Table
| Femtocoulombs per square metre (fC/m²) | Coulombs per square metre (C/m²) |
|---|---|
| 1 fC/m² | 1 × 10-15 C/m² |
| 2 fC/m² | 2 × 10-15 C/m² |
| 5 fC/m² | 5 × 10-15 C/m² |
| 10 fC/m² | 1 × 10-14 C/m² |
| 25 fC/m² | 2.5 × 10-14 C/m² |
| 50 fC/m² | 5 × 10-14 C/m² |
| 100 fC/m² | 1 × 10-13 C/m² |