Attogram (ag, ags)
Attogram (ag, ags) :
The prefix "atto" means 1/1,000,000,000,000,000,000 = 1e-18, so 1,000,000,000,000,000,000 ag = 1e+18 ag = 1 g. 1000 ag = 1 femtogram. 1 ag = 1e-21 kg. For comparison, one atom of carbon weighs approximately 2e-23 g so 50,000 atoms of carbon weigh roughly 1 attogram
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