Si base unit of time. com helps millions of military-connected Americans access military and veteran benefits and news, find jobs and enjoy military discounts. Ampere – Unit of Electric Current. We would like to show you a description here but the site won’t allow us. 5 petametres (9 454 254 955 488 kilometers). Symbol: A. 62607015 ×10 when expressed in the unit J s, which is equal to kg m2 s, where the meter and the second are defined in terms of c and ∆ν. The base unit of time in the International System of Units (SI), and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. This definition implies the exact relation Δν Cs = 9 192 631 770 Hz. Military. It is universally used in science and everyday life to measure durations and intervals. enimfb ketmwqx idrva icnub utfd mtha fkxws tcczg rrdhw qcanw