Orders of magnitude (time)
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[edit] Seconds
| Factor (s) | Multiple | common units | orders of magnitude |
|---|---|---|---|
| 10−44 | Planck time, the shortest physically meaningful instant of time ≈ 5.4×10−44 s | 10−44 s | |
| 10−24 | 1 yoctosecond | -- | 1 ys and less, 10 ys, 100 ys |
| 10−21 | 1 zeptosecond | -- | 1 zs, 10 zs, 100 zs |
| 10−18 | 1 attosecond | -- | 1 as, 10 as, 100 as |
| 10−15 | 1 femtosecond | -- | 1 fs, 10 fs, 100 fs |
| 10−12 | 1 picosecond | -- | 1 ps, 10 ps, 100 ps |
| 10−9 | 1 nanosecond | -- | 1 ns, 10 ns, 100 ns |
| 10−6 | 1 microsecond | sometimes (poorly) abbreviated as "us" or "usec" | 1 µs, 10 µs, 100 µs |
| 10−3 | 1 millisecond | blink of an eye ~ 50 to 80 ms | 1 ms, 10 ms, 100 ms |
| 100 | 1 second | minute = 60 s | 1 s, 10 s, 100 s |
| 103 | 1 kilosecond (16.7 minutes) |
hour = 3600 s day = 86 400 s = 86.4 ks week = 604.8 ks |
103 s, 104 s, 105 s |
| 106 | 1 megasecond (11.6 days) |
month = 2.6 x 106 s year = 31.6 Ms = 107.50 s ≈ π x 107 s |
106 s, 107 s, 108 s |
| 109 | 1 gigasecond (32 years) |
century = 3.16 Gs ≈ π×109 s millennium = 31.6 Gs ≈ π×1010 s |
109 s, 1010 s, 1011 s |
| 1012 | 1 terasecond (32 000 years) |
eon = 31.6 Ts ≈ π×1013 s | 1012 s, 1013 s, 1014 s |
| 1015 | 1 petasecond (32 million years) |
aeon = 31.6 Ps ≈ π×1016 s 4.3×1017 s ≈ 13.7 billion years, the approximate age of the universe |
1015 s, 1016 s, 1017 s |
| 1018 | 1 exasecond (32 billion years) |
-- | 1018 s, 1019 s, 1020 s |
| 1021 | 1 zettasecond (32 trillion years) |
-- | 1021 s, 1022 s, 1023 s |
| 1024 | 1 yottasecond (32 quadrillion years) |
-- | 1024 s, 1025 s, 1026 s and more |
[edit] Years
| Factor (a) | Multiple | common units | orders of magnitude |
|---|---|---|---|
| 10−50 | Planck time, the shortest physically meaningful instant of time ≈ 1.71×10−50 a | 10−50 a | |
| 10−24 | 1 yocto-annum | -- | 1 ya and less, 10 ya, 100 ya |
| 10−21 | 1 zepto-annum | -- | 1 za, 10 za, 100 za |
| 10−18 | 1 atto-annum | -- | 1 aa, 10 aa, 100 aa |
| 10−15 | 1 femto-annum | -- | 1 fa, 10 fa, 100 fa |
| 10−12 | 1 pico-annum | -- | 1 pa, 10 pa, 100 pa |
| 10−9 | 1 nano-annum | 1 second = 3.17 × 10-8 a ≈ 10-7.50 a | 1 na, 10 na, 100 na |
| 10−6 | 1 micro-annum | 1 minute = 1.90 × 10-6 a 1 hour = 1.40 × 10-4 a |
1 ua, 10 ua, 100 ua |
| 10−3 | 1 milli-annum | 1 day = 2.73 × 10-3 a 1 week = 1.91 × 10-2 a |
1 ma, 10 ma, 100 ma |
| 100 | 1 annum | year = 1 annum decade = 10 anna century = 100 anna |
1 a, 10 a, 100 a |
| 103 | 1 kilo-annum | millennium = 1000 anna | 103 a, 104 a, 105 a |
| 106 | 1 mega-annum | eon = 1,000,000 anna | 106 a, 107 a, 108 a |
| 109 | 1 giga-annum | aeon = 1,000,000,000 anna 1.37×1010 a ≈ 13.7 billion years, the approximate age of the universe |
109 a, 1010 a, 1011 a |
| 1012 | 1 tera-annum | --- | 1012 a, 1013 a, 1014 a |
| 1015 | 1 peta-annum | --- | 1015 a, 1016 a, 1017 a |
| 1018 | 1 exa-annum | -- | 1018 a, 1019 a, 1020 a |
| 1021 | 1 zetta-annum | -- | 1021 a, 1022 a, 1023 a |
| 1024 | 1 yotta-annum | -- | 1024 a, 1025 a, 1026 and more |
The pages linked in the right-hand column contain lists of times that are of the same order of magnitude (power of ten). Rows in the table represent increasing powers of a thousand (3 orders of magnitude).
Conversion from year to second is year × 31 557 600 using the Julian year. Conversion from log10year to log10second is approximately log10year + 7.50. Example conversion; 1year = 100year = 100 + 7.50seconds = 100.50 + 7s = 3.16 * 107s.
