Convert Femtoseconds to Seconds
Convert Femtoseconds (fs) to Seconds (s) instantly and accurately.
Conversion Formula
s = fs × 1.000000000e-15
About Femtoseconds
A femtosecond (fs) = 10⁻¹⁵ s - the timescale of molecular vibrations and chemical reactions. Bond stretching: 10-200 fs; bending: 50-500 fs. Ahmed Zewail won the 1999 Nobel Prize in Chemistry for femtochemistry, capturing transition states in real time. Ti:sapphire lasers produce 10-100 fs pulses; LASIK uses 10-100 fs for precise corneal cuts. At 800 nm, one optical cycle = 2.67 fs. Light travels 300 nm in 1 fs. 1 fs = 10⁻¹⁵ s.
About Seconds
The second (s) is the SI base unit of time, defined since 1967 as exactly 9,192,631,770 periods of the caesium-133 ground-state hyperfine transition at 0 K. Caesium fountain clocks realise this to ~10⁻¹⁶ (1 s lost per ~300 million years); optical lattice clocks (Sr, Yb) reach ~10⁻¹⁸. The second links to the metre via the defined speed of light c = 299,792,458 m/s exactly. 1 s = 1,000 ms = 1/60 min.
Quick Reference Table
| Femtoseconds (fs) | Seconds (s) |
|---|---|
| 1 fs | 1 × 10-15 s |
| 2 fs | 2 × 10-15 s |
| 5 fs | 5 × 10-15 s |
| 10 fs | 1 × 10-14 s |
| 25 fs | 2.5 × 10-14 s |
| 50 fs | 5 × 10-14 s |
| 100 fs | 1 × 10-13 s |