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Questions and Answers
What is the SI unit of thermodynamic temperature?
What is the SI unit of thermodynamic temperature?
What is the derived unit of force?
What is the derived unit of force?
What is the prefix that denotes 10⁻³?
What is the prefix that denotes 10⁻³?
What is the conversion factor to convert 1 meter to centimeters?
What is the conversion factor to convert 1 meter to centimeters?
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What is the fundamental unit of amount of substance?
What is the fundamental unit of amount of substance?
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What is the derived unit of energy?
What is the derived unit of energy?
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Study Notes
Fundamental Units
- There are seven fundamental units in the International System of Units (SI):
- Meter (m) - length
- Kilogram (kg) - mass
- Second (s) - time
- Kelvin (K) - thermodynamic temperature
- Ampere (A) - electric current
- Mole (mol) - amount of substance
- Candela (cd) - luminous intensity
Derived Units
- Derived units are formed by combining fundamental units:
- Velocity: meter per second (m/s)
- Acceleration: meter per second squared (m/s²)
- Force: newton (N) = kilogram meter per second squared (kg·m/s²)
- Energy: joule (J) = newton meter (N·m) or kilogram meter squared per second squared (kg·m²/s²)
Prefixes
- Prefixes are used to denote multiples and fractions of units:
- SI prefixes:
- Kilo- (k): 10³
- Centi- (c): 10⁻²
- Milli- (m): 10⁻³
- Micro- (μ): 10⁻⁶
- Nano- (n): 10⁻⁹
- Other prefixes:
- Deci- (d): 10⁻¹
- Hecto- (h): 10²
- SI prefixes:
Conversion between Units
- Conversion between units involves multiplying or dividing by a conversion factor:
- Example: 1 meter = 100 centimeters (cm)
- Conversion factor: 1 m = 100 cm/m
- To convert 5 m to cm: 5 m × (100 cm/m) = 500 cm
Fundamental Units
- There are 7 fundamental units in the International System of Units (SI)
- Meter (m) is the unit of length
- Kilogram (kg) is the unit of mass
- Second (s) is the unit of time
- Kelvin (K) is the unit of thermodynamic temperature
- Ampere (A) is the unit of electric current
- Mole (mol) is the unit of amount of substance
- Candela (cd) is the unit of luminous intensity
Derived Units
- Derived units are formed by combining fundamental units
- Velocity is measured in meter per second (m/s)
- Acceleration is measured in meter per second squared (m/s²)
- Force is measured in newton (N) or kilogram meter per second squared (kg·m/s²)
- Energy is measured in joule (J) or kilogram meter squared per second squared (kg·m²/s²)
Prefixes
- Prefixes are used to denote multiples and fractions of units
- Kilo- (k) denotes 10³
- Centi- (c) denotes 10⁻²
- Milli- (m) denotes 10⁻³
- Micro- (μ) denotes 10⁻⁶
- Nano- (n) denotes 10⁻⁹
- Deci- (d) denotes 10⁻¹
- Hecto- (h) denotes 10²
Conversion between Units
- Conversion between units involves multiplying or dividing by a conversion factor
- 1 meter is equal to 100 centimeters (cm)
- Conversion factor: 1 m = 100 cm/m
- To convert 5 m to cm: 5 m × (100 cm/m) = 500 cm
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Description
Test your knowledge of the seven fundamental units in the International System of Units (SI) and their derived units. Learn to distinguish between meters, kilograms, seconds, and more!
