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Questions and Answers
What does the abbreviation SI stand for in the context of units?
How many base units are there in the SI system?
What is the unit of electric current in the SI system?
What is the prefix that represents 10³ in the SI system?
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What is the benefit of using SI units in international communication and trade?
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What is the unit of luminous intensity in the SI system?
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Study Notes
SI Units
Definition
- SI units are the modern metric system of units
- Established in 1960 by the 11th General Conference on Weights and Measures
- SI stands for Système International d'Unités (International System of Units)
Base Units
- There are 7 base units in the SI system:
- Meter (m) - unit of length
- Kilogram (kg) - unit of mass
- Second (s) - unit of time
- Ampere (A) - unit of electric current
- Kelvin (K) - unit of thermodynamic temperature
- Mole (mol) - unit of amount of substance
- Candela (cd) - unit of luminous intensity
Derived Units
- Derived units are formed by combining base units
- Examples:
- Velocity: meter per second (m/s)
- Force: newton (N) = kilogram meter per second squared (kg m/s²)
- Energy: joule (J) = newton meter (N m)
Prefixes
- Used to form multiples and submultiples of SI units
- Examples:
- Kilo- (k) = 10³ (e.g., kilogram = 1000 grams)
- Milli- (m) = 10⁻³ (e.g., millimeter = 0.001 meters)
- Micro- (μ) = 10⁻⁶ (e.g., micrometer = 0.000001 meters)
Benefits
- SI units provide a consistent and coherent system of measurement
- Facilitate international communication and trade
- Simplify scientific and technical calculations
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Description
Learn about the International System of Units (SI), its definition, base units, derived units, and prefixes. Understand the benefits of using SI units in international communication, trade, and scientific calculations.
