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Atomska enota mase - Wikipedija, prosta enciklopedija

Atomska enota mase

Iz Wikipedije, proste enciklopedije

Atómska enôta máse je enota za merjenje mase v atomski in jedrski fiziki. Definirana je kot 1/12 mase atoma ogljika 12C. Posebej v tujejezični literaturi se zanjo včasih uporablja tudi izraz dalton, v čast angleškemu kemiku Johnu Daltonu. Med uporabljenimi okrajšavami so a.e.m., u, amu in Da.

Številčna vrednost atomske enote mase je

1 u ≈ 1,660.540.2 · 10-27 kg

Atomska enota mase je priročna enota za merjenje mase atomov: atom vodika tehta približno 1 u; atom z masnim številom A pa približno A u (odstopanja so posledica jedrske vezavne energije).

Atomska enota mase je definirana tako, da tehta Avogadrovo število atomskih enot mase natanko 1 gram:

1 u = 1 g/mol
1 g = NA u

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