Is esu a CGS or SI unit?
Answer : The **esu** (electrostatic unit) is part of the **CGS (centimeter-gram-second)** system of units, not the **SI (International System of Units)**. In the CGS system, the **esu** is used to measure quantities ... the SI system being the standard. So, in short: **esu is a CGS unit**, not an SI unit....
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