Metric System

International System of Units (SI)

International System

The international System – SI units, in multiples of TEN, provide a standard of consistent measurement for global science, business, and industry

Basic Metric Units

Meter (m)Gram (g)Liter (l)Celsius (°C)

or Kelvin (K)

Second (s)Newton (N)Change over

time

Length

MassVolume

Temperature

Time

Weight

Rate

LENGTH

Length-distance between two points Measure pencil – use centimeters Measure distance from New York to

Chicago – use kilometers METER is the basic unit of length

VOLUME

Amount of space an object takes up; SI unit – cubic meter (m3 )

To find volume of regular shape – measure length, width, and height and multiply them all

To find volume of irregular shape – volume by immersion

MASS

Amount of matter in an objectSI unit = kilogramOne liter of water has a mass of

about 1 kgSmaller masses are measured in

grams (g); one gram is about the mass of a large paper clip

WEIGHT

Measurement of forceSI unit = newton (N)Weight depends on gravity, which

can change depending on where the object is located

Where would you weight more……on Earth or on Mars??

TEMPERATURE

Measure of kinetic energy in particles of matter; SI unit – kelvin (K)

Other measurements of temperature include degrees Celsius and degrees Fahrenheit

TIME

Interval between two events; SI unit = second (s)

Rate is the amount of change of one measurement in a given amount of time E.g. Speeds are often measured in

kilometers per hour or miles per hour

Derived Units

Area – amount of surface included within a set of boundaries; expressed in square units of length, e.g., m2

Volume – amount of space occupied by an object, e.g., m3 for solids or mL or L for liquids

Density – amount of matter that occupies a given space; mass/volume, e.g., g/mL

Basic units: m, l, g

Many M mega 1 000 000 (106)

Kids k kilo 1000 (103)

Have h hecto 100 (102)

Dropped da/dk deka 10 (101)

Over --- Basic Unit (ONES)--- 1 (100)

Dead d deci .1 (10-1)

Converting c centi .01 (10-2)

Metrics m milli .001 (10-3)

----- micro .000001 (10-6)

----- n nano .000000001 (10-9)

----- A Angstrom .0000000001 (10-10)

422. cm =

Smaller to bigger - Move decimal left

Bigger to smaller - Move decimal right

4.22 m

69.63 l =

9.23 g =

6523. m =

13 dal =

230 mg =kg

m

ml

g

ml69630

0.00923

0.006523

130,000

0.230

M k nμm cd

100 (m, l, g)

dah Basic Unit

Many kids have dropped over dead converting metrics

3 33

Celsius The Metric Temperature Scale

Definitions 0°Celsius(C) = 32°Fahrenheit(F) = water freezes 100°Celsius = 212°Fahrenheit = water boils

Also called the centigrade scale.

Conversions °Celsius = 5/9 X (°Fahrenheit - 32°) °Fahrenheit = (9/5 X °Celsius) + 32°

30 is hot,

20 is nice,

10 is chilly,

0 is ice.

REVIEW “QUIZ”

1) 345 cm =

3) k h da (m,l,g) d cm

km

2) 22ºC =

ºF

0.00345

71.6

kilo-

Fill in the missing prefixes.

hecto- deci-

centi- milli-deka-

Drawings, Tables, and Graphs

Scientific Illustrations – often make information more clear than written text can Drawings: can emphasize only necessary

details or show things you can’t see Photographs: show an object exactly as

it is at a single momentTables – display information in rows

and columns for easier comprehension

Drawings, Tables, and Graphs

Graphs: collect, organize, and summarize data visually Line graph –shows relationship between

two variables, which must be numbers Bar graph – uses bars of different sizes

to show relationships between variables; one variable is divided into parts; the other variable is a number

Drawings, Tables, and Graphs

Graphs: collect, organize, and summarize data visually Circle graph – shows parts of a whole as

percentages Scales on graphs must be carefully

constructed and analyzed so users easily understand the info

What Kind of Graph is This?

LINE GRAPH

What Kind of Graph is This?

Circle Graph

What Kind of Graph is This?

Bar Graph