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Questions and Answers
What is the purpose of SI prefixes?
What type of prefix is 'kilo-'?
What is the value of the prefix 'micro-'?
What is the symbol for 'nano-'?
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What is 1 millimeter (mm) equal to?
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What is the smallest SI prefix?
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What is the value of 1 picosecond (ps)?
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Study Notes
SI Prefixes
SI prefixes are used to form decimal multiples and submultiples of SI units.
Types of SI Prefixes
- Multiplicative Prefixes: used to form multiples of a unit
- Subtractive Prefixes: used to form submultiples of a unit
List of Common SI Prefixes
-
Multiplicative Prefixes
- kilo- (10^3 or 1,000)
- hecto- (10^2 or 100)
- deka- (10^1 or 10)
- deci- (10^-1 or 0.1)
- centi- (10^-2 or 0.01)
- milli- (10^-3 or 0.001)
- micro- (10^-6 or 0.000001)
- nano- (10^-9 or 0.000000001)
- pico- (10^-12 or 0.000000000001)
- femto- (10^-15 or 0.000000000000001)
- atto- (10^-18 or 0.000000000000000001)
-
Subtractive Prefixes
- deca- (10^1 or 10)
- deci- (10^-1 or 0.1)
- centi- (10^-2 or 0.01)
- milli- (10^-3 or 0.001)
- micro- (10^-6 or 0.000001)
- nano- (10^-9 or 0.000000001)
- pico- (10^-12 or 0.000000000001)
- femto- (10^-15 or 0.000000000000001)
- atto- (10^-18 or 0.000000000000000001)
- zepto- (10^-21 or 0.000000000000000000001)
- yocto- (10^-24 or 0.000000000000000000000001)
Examples of SI Prefixes in Use
- 1 kilometer (km) = 1,000 meters
- 1 milligram (mg) = 0.001 grams
- 1 micrometer (μm) = 0.000001 meters
- 1 nanosecond (ns) = 0.000000001 seconds
SI Prefixes
- SI prefixes are used to form decimal multiples and submultiples of SI units.
- There are two types of SI prefixes: multiplicative prefixes and subtractive prefixes.
Types of SI Prefixes
- Multiplicative prefixes are used to form multiples of a unit.
- Subtractive prefixes are used to form submultiples of a unit.
List of Common SI Prefixes
- Multiplicative prefixes:
- kilo- = 10^3 or 1,000
- hecto- = 10^2 or 100
- deka- = 10^1 or 10
- deci- = 10^-1 or 0.1
- centi- = 10^-2 or 0.01
- milli- = 10^-3 or 0.001
- micro- = 10^-6 or 0.000001
- nano- = 10^-9 or 0.000000001
- pico- = 10^-12 or 0.000000000001
- femto- = 10^-15 or 0.000000000000001
- atto- = 10^-18 or 0.000000000000000001
Subtractive Prefixes
- deca- = 10^1 or 10
- deci- = 10^-1 or 0.1
- centi- = 10^-2 or 0.01
- milli- = 10^-3 or 0.001
- micro- = 10^-6 or 0.000001
- nano- = 10^-9 or 0.000000001
- pico- = 10^-12 or 0.000000000001
- femto- = 10^-15 or 0.000000000000001
- atto- = 10^-18 or 0.000000000000000001
- zepto- = 10^-21 or 0.000000000000000000001
- yocto- = 10^-24 or 0.000000000000000000000001
Examples of SI Prefixes in Use
- 1 kilometer (km) = 1,000 meters
- 1 milligram (mg) = 0.001 grams
- 1 micrometer (μm) = 0.000001 meters
- 1 nanosecond (ns) = 0.000000001 seconds
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Description
Learn about the different types of SI prefixes, including multiplicative and subtractive prefixes, and how they are used to form multiples and submultiples of SI units.
