Si Units Fundamentals

Question

Which of the following is NOT an SI base unit?

RankGuru · Accepted Answer

1. **SI Base Units**: The International System of Units (SI) defines seven fundamental base units from which all other units are derived.
2. **The Seven Base Units**:
   - Mass: **kilogram** (kg)
   - Luminous Intensity: **candela** (cd)
   - Electric Current: **ampere** (A)
   - Length: **meter** (m)
   - Time: **second** (s)
   - Temperature: **kelvin** (K)
   - Amount of substance: **mole** (mol)
3. **Analysis of Options**: Kilogram, Candela, and Ampere are all on this list.
4. **Conclusion**: **Liter** is a unit of volume. Since volume is defined as $(	ext{length})^3$, the SI unit for volume is the cubic meter (m³). The liter ($1$ L $= 10^{-3}$ m³) is a non-SI unit accepted for use with SI.

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Si Units Fundamentals

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