Physical quantities which have a unit but no dimensions.

1. Plane angle (radian)
2. Solid angle (steradian)
3. Relative density (specific gravity)
4. Refractive index

Physical quantities that have a unit but no dimensions are called scalar quantities.

Examples of scalar quantities include:

- Temperature (measured in degrees Celsius, Fahrenheit, or Kelvin)
- Mass (measured in kilograms, grams, or pounds)
- Volume (measured in cubic meters, liters, or gallons)
- Time (measured in seconds, minutes, or hours)
- Energy (measured in joules, calories, or kilowatt-hours)
- Power (measured in watts, horsepower, or kilowatts)