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**Measuring Matter and Metric Conversions**

Why is SI (metric system) so useful to scientists? One major advantage of the metric system is that it uses the decimal system, where all units are related to smaller or larger units by dividing or multiplying by 10.

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**Metric System SI System of Measurement**

Originally established in France-1790 1960 – Revised version called SI International System of Units (Le Systé́me International d’ Unités The orderliness of this system makes it useful for scientific work and it is used by scientists all over the world.

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**Conversions 1 inch = 2.54 cm 1 foot = 30.5 cm 1 meter = 1.0963 yards**

1 kilometer = 0.60 miles 1 kilogram = 2.2 pounds 1 ounce = 28.3 grams 1 liter = 1.06 quarts

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SI Base Units Are there any other SI Base Units?

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**Kilo 103 Hecto 102 Deka 101 Basic 100 Deci 10-1 meter gram Centi Liter**

10-2 Milli 10-3 Mega = M Kilo = k Hecto = h Deka = da Basic = m meter g gram L liter / Deci = d / Centi = c / Milli = m millionth Micro = u billionth Nano = n

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**Conversions Move the Decimal Along the Ladder**

Convert 10g to kg Convert 1 000mL to L Convert mm to km

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**Making Conversions with Conversion Factors**

When converting one unit into another, a conversion factor is incredibly useful, but can be a little tricky. Multiply your original value by a fraction that shows the relationship of the unit you start with to the unit into which you are changing. For example: Convert 157 centimeters (cm) into meters (m). 157 cm x m/100cm = m

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Units of Volume to Know Volume – space occupied by any sample of matter Length x Width x Height Derived by units of length (meter) 10 cm x 10 cm x 10 cm =1000 cm3 =1L 1 dm = 10 cm 1000 cm3 = 1 dm3 = 1 L Milliliter and cubic centimeter are used interchangeably (1 mL = 1cm3)

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