Zepto

Updated on Nov 30, 2023

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Zepto (unit symbol z) is a unit prefix in the metric system denoting a factor of 10⁻²¹ or 0.000000000000000000001.

Adopted in 1991, it comes from the Latin septem, meaning "seven", since it is equal to 1000⁻⁷.

Examples of its use:

The electric charge on one electron: 160.217657 zeptocoulombs (zC).

One zeptomole (zmol) of substance contains 602 particles.

The human insulin molecule has a mass of roughly 10 zeptograms.

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