Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
What are fundamental or base units defined as?
What are fundamental or base units defined as?
- Units that are only used in derived quantities.
- Units that measure derived physical quantities. (correct)
- Units that are specific to historical measurement systems.
- Units for fundamental or base quantities that do not depend on other units.
Which system is currently internationally accepted for measurements?
Which system is currently internationally accepted for measurements?
- CGS system.
- Système Internationale d'Unites (SI). (correct)
- MKS system.
- FPS system.
Which of the following is NOT a base unit in the CGS system?
Which of the following is NOT a base unit in the CGS system?
- Centimetre.
- Kilogram. (correct)
- Gram.
- Second.
What is a derived unit?
What is a derived unit?
Signup and view all the answers
What does the SI unit system facilitate due to its decimal nature?
What does the SI unit system facilitate due to its decimal nature?
Signup and view all the answers
Flashcards are hidden until you start studying
Study Notes
Introduction to Units and Measurements
- Measurement involves comparing a physical quantity with a universally accepted reference standard known as a unit.
- Results of measurements consist of a numerical value accompanied by its unit.
- A limited number of units can express a vast array of physical quantities due to their interrelated nature.
- Fundamental or base quantities have specific units called fundamental units.
- Derived quantities are expressed as combinations of base units, resulting in derived units.
- The collective system of both base and derived units is referred to as the system of units.
The International System of Units (SI)
- Historically, various countries used different measurement systems, including CGS (centimetre-gram-second), FPS (foot-pound-second), and MKS (metre-kilogram-second).
- CGS system: Length - centimetre, Mass - gram, Time - second.
- FPS system: Length - foot, Mass - pound, Time - second.
- MKS system: Length - metre, Mass - kilogram, Time - second.
- The current internationally accepted measurement system is the Système Internationale d’Unités (SI).
- Developed by the General Conference on Weights and Measures in 1971 for global technical, industrial, and commercial standardization.
- SI units utilize a decimal system, facilitating easy and convenient conversions within the system.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
