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unit

Time

Definition

The time in physics is the size and nature can be presented as a measure of the change. The acceptation of classical physics, time is a continuum, which can flow only in one direction.

1 second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom at temperature of 0 kelvin.

 

system of units:   SI;
statute:   the base unit;
name the value:   t;
unit name:   second;
symbol unit:   s;
dimension:   T;
expression in other units:   min, h, d, year,;

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Units of measurement

namesymbol value in SI unit:
s
note
1 natural unit of time h/(me co2)≈ 1.288 088 667 7(86) × 10-21 
1 atomic unit of time h/Eh≈ 2.418 884 326 505 (16) × 10-17 
1 shake  = 1.0-8 
1 secound, siderală s≈ 0.997 269 6 
1 minute min= 60 
1 minute, sideral min≈ 59.836 17 
1 hour h= 3 600(1)
1 hour, sideral h≈ 3 590.17 
1 dey d= 86 400(2)
1 dey, sideral d≈ 86 164.09 
1 year year= 31 536 000(3)
1 year, sideral  ≈ 31 558 150 
1 year, tropical  ≈ 31 556 930 
1 year, bissextile  ≈ 31 622 400(4)
1 decade  = 3,153 6 × 108(5)
1 century  = 3,153 6 × 109(6)
1 millennium  = 3,153 6 × 1010(7)
    
1 year gregoriene year≈ 31 556 952(8)

Note:

(1) - 60 minutes;

(2) - 24 hours;

(3) - 365 deys;

(4) - 366 deys;

(5) - 10 years;

(6) - 100 years;

(7) - 1 000 years;

(8) - 365,242 5 dey;