Podcast
Questions and Answers
What is the unit for mass in the International System of Units (SI)?
What is the unit for mass in the International System of Units (SI)?
- Gram (g)
- Ounce (oz)
- Kilogram (Kg) (correct)
- Pound (lb)
Which of the following pairs correctly matches a fundamental quantity with its unit in SI?
Which of the following pairs correctly matches a fundamental quantity with its unit in SI?
- Mass - Pound
- Temperature - Celsius
- Time - Second (correct)
- Length - Foot
How many base units are there in the International System of Units (SI)?
How many base units are there in the International System of Units (SI)?
- 7 (correct)
- 5
- 12
- 10
What is the dimensionless unit used to measure plane angle in SI?
What is the dimensionless unit used to measure plane angle in SI?
Which of the following is a derived unit based on SI base units?
Which of the following is a derived unit based on SI base units?
What is the SI unit for luminous intensity?
What is the SI unit for luminous intensity?
Which system of units was developed for international use in scientific and technical work?
Which system of units was developed for international use in scientific and technical work?
The unit for solid angle in the International System of Units (SI) is what?
The unit for solid angle in the International System of Units (SI) is what?
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Study Notes
Overview of Measurement Systems
- Different measurement systems historically used include CGS (centimeter, gram, second), FPS (foot, pound, second), and MKS (meter, kilogram, second).
- The International System of Units (SI), known as Système Internationale d'Unités, standardizes measurements globally.
- SI units were created and endorsed by the General Conference on Weights and Measures in 1971 for international scientific, technical, industrial, and commercial use.
- SI employs a decimal system, facilitating simple unit conversions.
Fundamental Units in SI
- SI comprises seven fundamental units, each representing a base physical quantity:
- Length: Meter (M)
- Mass: Kilogram (kg)
- Time: Second (s)
- Temperature: Kelvin (K)
- Electric Current: Ampere (A)
- Luminous Intensity: Candela (Cd)
- Amount of Substance: Mole (mol)
- Plane angle is measured in radians (rad), and solid angle in steradians (sr); both are dimensionless.
Derived Units
- Derived units are formed by combining fundamental units to express additional physical quantities.
- Examples of derived units include volume and density.
- A complete unit system includes both fundamental and derived units, enabling comprehensive measurement of physical phenomena.
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