Which of the following is NOT a fundamental or base units?

The correct answer is Volume.

Key Points

• Volume is not considered a fundamental unit in the International System of Units (SI).
• Fundamental units are those that are defined independently of other units and are used to describe the basic physical quantities.
• The fundamental or base units in SI include the meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity).
• Volume is a derived unit and can be expressed in terms of the fundamental units, typically as cubic meters (m³).

Additional Information

• Meter (m)
  • The meter is the SI base unit of length.
  • It is defined by the distance light travels in a vacuum in 1/299,792,458 seconds.
• Kilogram (kg)
  • The kilogram is the SI base unit of mass.
  • It is defined by the Planck constant, which is 6.62607015 × 10⁻³⁴ kg·m²/s.
• Second (s)
  • The second is the SI base unit of time.
  • It is defined by the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.
• Derived Units
  • Derived units are combinations of the seven fundamental units.
  • Examples include velocity (meters per second), force (newtons), and volume (cubic meters).