second
| Symbol: | s |
| Category: | Time |
| SI Equivalent: | 1 s |
| Dimension: | T |
| System: | SI |
| Notes | |
| The fundamental unit of time in the SI system. It is defined as 9,192,631,770 cycles of the radiation associated with the transition between the two hyperfine levels of the ground state of the cesium-133 atom. | |
1 s =
| Permeability coefficient | ||
| Symbol | Unit Name | |
| 1 | kg-m/N-s | kilogram meter per newton per second |
| 6.88127×1011 | perm-inch (0 °C) | perm-inch (0°C) |
| 6.85265×1011 | perm-inch (23 °C) | perm-inch (23°C) |
| 6.88127×1014 | perm-mil (0 °C) | perm-mil (0°C) |
| 6.85265×1014 | perm-mil (23 °C) | perm-mil (23°C) |
| Time | ||
| Symbol | Unit Name | |
| 4.13414×1016 | a.u. | a.u. of time |
| 1.15741 | blink | |
| 1.15741×10-5 | d | day |
| 1.16058×10-5 | d (sider.) | day (sidereal) |
| 8.2672×10-7 | fortnight | |
| 2.77778×10-4 | h | hour |
| 1.06388×1023 | Jordan's elementary time | |
| 1×106 | ms | microsecond |
| 1000 | ms | millisecond |
| 1.66667×10-2 | min, mn | minute |
| 3.85802×10-7 | month (30 days) | |
| 4.23623×10-7 | month (sidereal) | |
| 3.80518×10-7 | month (solar mean) | |
| 3.91935×10-7 | month (synodic), lunar month | |
| 1×109 | ns | nanosecond |
| 1×108 | shake | |
| 1.65344×10-6 | w | week |
| 3×109 | wink | |
| 3.16878×10-8 | aastr. | year (astronomical), Bessel year |
| 3.17098×10-8 | a, y | year (calendar) |
| 3.16875×10-8 | year (sidereal) | |
| 3.16881×10-8 | a, y | year (solar mean) |
| 3.16888×10-8 | atrop. | year (tropical) |