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The Metric System

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The Metric System

Base Ten Measurement

- Scientists use the metric system as their system of measurement (International System of Units, SI).

- The Metric System is a decimal system, based on the number “10” and multiples of ten.

- Scientists use metric units to measure WHAT ???

Length

Volume

Mass

Temperature

- The basic unit of length is the meter (m)

- 1 m = 39.4 inches

- All other lengths in the metric system are measured in relation to the meter.

milli-meter

centi-meter

kilo-meter

nano-meter

What about the mega-meter or the giga-meter?

Length is usually measuredwith a ruler

Length is also called distance. Distance is used to determine velocity

Velocity = distance time

- Mass is a measure of the amount of matter in an object

- The basic unit of mass was originally the gram (g)

- The basic unit of mass has since been changed to the kilogram (kg)

bigger atoms

or

More matter means one of three things:

more atoms

or both

Mass is usually measuredwith a scale

Mass is sometimes called weight, though they are not quite the same.

Changes in gravity result in changes in weight,but mass stays the same

- Volume is the amount of space an object takes up

- The basic unit of volume is the liter (L)

- The metric unit to measure the volume of a solid is a cubic centimeter (cm3 or cc), but …

1 cm3 = 1 mL

also

1 g of H20 at 1° Celsius = I mL = 1 cm3

Liquid volume is usually measured with a graduated cylinder or beaker

(or a 2 L bottle)

5 cm

Solid volume is measured with a ruler

5 cm

5 cm

5 x 5 x 5 = 125 cc (or cm3)

- Temperature is a measure of the energy contained in the motion of the particles of a substance

- The basic unit of temperature is the degree

- Many scales are used to measure temperature, and the metric system uses degrees Celsius (C)

H20freezes at 0° C

H20boils at 100° C

3O° Celsius is pretty darn hot!

2O° Celsius feels quite nice

10° Celsius, grab a coat dude

O° Celsius, you’re seeing ice

So what is the temperature today, you’d say?

bigger

smaller

- kilo = one thousand

- centi = one hundredth

- mega = one million

- milli = one thousandth

- micro = one millionth

- giga = one billion

- nano = one billionth

prefix

+

unit

- kilo

- centi

meter

- mega

+

liter

- giga

- milli

gram

- micro

- nano

Want more prefixes?