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The Metric System

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The Metric System

Catherine Le (Ilona Davies)

The Harker School

2007-2008

- Scientists all over the world use a set of measuring units called the International System of Units (SI).
- SI is a revised version of the metric system, which is based on multiples of 10.

- SI is built upon seven base units and many derived units.
- For example, the base unit for length is meter (m) and the derived unit for volume (length x length x length) is cubic meters (m3).

- Length
- Meter (m)

- Volume
- Liter (L or l)

- Mass
- Gram (g)

http://www.onlineconversion.com/

Reference: http://physics.nist.gov/cuu/Units/index.html

- Measurements must have a value and a unit (for example, 53 meters).
- A metric prefix indicates how many times a unit should be multiplied or divided by 10. For example, 1000 meters = 1 kilometer.
- The prefix “kilo-” tells us that we need to multiply km by 1000 to convert to m.

- A conversion factor is a ratio of equivalent measurements that is used to convert a quantity of one unit to another.
- To convert s to ms, you would multiply by a conversion factor of 1000 ms/1 s.

UP RULE

Decimal Moves Left

one place for each step you go up.

Kilo

Hecto

Deca

Base

Unit

(Meter

Liter

Gram)

Deci

Centi

Milli

Decimal Moves Right one place for each step you go down.

DOWN RULE

- What is the numerical value of the following prefixes?
- Deci = ________________
- Hecto = ________________
- Milli = ______________
- Deca = ________________
- Kilo = ___________________

- What is the unit of measurement for the following?
- Length = _________________
- Volume = _________________
- Mass = ________________

- 1 km = ____________ m
- 1 m = ____________ cm
- 1 mm = ____________dm
- 1 dm = ____________ dam
- 1 liter = ____________ cm3 (Hint: 1mL = 1 cm3)
- 1 kg = ____________ g