Fundamental units

Definition

Fundamental units are the basic units of measurement defined by a standard, from which all other units are derived. Examples include meters for length, kilograms for mass, and seconds for time.

5 Must Know Facts For Your Next Test

1. The International System of Units (SI) defines seven fundamental units: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd).
2. All physical quantities can be expressed as combinations of these fundamental units.
3. Fundamental units provide a consistent framework for scientific measurements across different disciplines.
4. The definition of some fundamental units has evolved over time based on advances in science and technology.
5. Derived units such as Newtons or Joules are formed by combining fundamental units according to algebraic relationships.

Review Questions

• What are the seven fundamental units defined by the International System of Units (SI)?
• How do derived units relate to fundamental units?
• Why is it important to have standard definitions for fundamental units?

Related terms

Derived Units:

Units that are formed by combining fundamental units according to algebraic relationships, such as Newtons or Joules.

International System of Units (SI): A globally accepted system for measuring physical quantities, consisting of seven base units.

Physical Quantities: \text{Properties} or aspects that can be measured, often expressed as a combination of numerical value and unit.