| Liōng |
Hû-hō |
Ti̍t |
Relative Standard Uncertainty |
| characteristic impedance of vacuum |
 |
376.730 313 461... Ω |
Tēng-gī |
| electric constant (permittivity of free space) |
 |
8.854 187 817... × 10-12F·m-1 |
Tēng-gī |
| magnetic constant (permeability of free space) |
 |
4π × 10-7 N·A-2 = 1.2566 370 614... × 10-6 N·A-2 |
Tēng-gī |
| Newtonian constant of gravitation |
 |
6.6742(10) × 10-11m3·kg-1·s-2 |
1.5 × 10-4 |
| Planck ê tiāⁿ-sò͘ |
 |
6.626 0693(11) × 10-34 J·s |
1.7 × 10-7 |
| Dirac ê tiāⁿ-sò͘ |
 |
1.054 571 68(18) × 10-34 J·s |
1.7 × 10-7 |
| speed of light in vacuum |
 |
299 792 458 m·s-1 |
Tēng-gī |
