A prefix meaning one-sextillionth (1/1,000,000,000,000,000,000,000 or 10-21)
The same as multiplying by 10-21 (which is 0.000 000 000 000 000 000 001)
Prefix is z
Example: 12 zg = 12 zeptograms = 0.000 000 000 000 000 000 012 g
The mass of 1 single molecule of glucose (a simple sugar found in many foods) is 0.3 zg
(This teaspoon will contain about 500,000,000,000,000,000,000 molecules of glucose, each of which has a mass of 0.3 zg)
