| 1.45 | base unit | ||
| Measurement unit that is adopted by convention for a base quantity. | |||
| Note 1: | In each coherent system of units, there is only one base unit for each base quantity. | ||
| Example: | In the SI, the metre is the base unit of length. In the CGS systems, the centimetre is the base unit of length. | ||
| Note 2: | A base unit may also serve for a derived quantity of the same quantity dimension. | ||
| Example: | Rainfall, when defined as areic volume (volume per area), has the metre as a coherent derived unit in the SI. | ||
| Note 3: | For number of entities, the number one, symbol 1, can be regarded as a base unit in any system of units. | ||
| Source: [VIM 1.10]. | |||
| 1.45 | base unit | ||
| Measurement unit that is adopted by convention for a base quantity. | |||
| Note 1: | In each coherent system of units, there is only one base unit for each base quantity. | ||
| Example: | In the SI, the metre is the base unit of length. In the CGS systems, the centimetre is the base unit of length. | ||
| Note 2: | A base unit may also serve for a derived quantity of the same quantity dimension. | ||
| Example: | Rainfall, when defined as areic volume (volume per area), has the metre as a coherent derived unit in the SI. | ||
| Note 3: | For number of entities, the number one, symbol 1, can be regarded as a base unit in any system of units. | ||
| Source: [VIM 1.10]. | |||