**Full name:** zettasiemens

**Plural form:** zettasiemens

**Symbol:** ZS

**Category type:** electric conductance

**Scale factor:** 1.0E+21

The SI derived unit for electric conductance is the siemens.

1 siemens is equal to 1.0E-21 zettasiemens.

Valid units must be of the **electric conductance** type.

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The SI prefix "zetta" represents a factor of
10^{21}, or in exponential notation, 1E21.

So 1 zettasiemens = 10^{21} siemens.

The definition of a siemens is as follows:

The siemens is the SI derived unit of electric conductance. It is equal to inverse ohm. It is named after the German inventor and industrialist Ernst Werner von Siemens, and was previously called the mho. In English, the term siemens is used both for the singular and plural. The 14th General Conference on Weights and Measures approved the addition of the siemens as an SI derived unit in 1971.

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