SI Units

THE METRIC SYSTEM

METRIC SYSTEM EST. 1797

WORLD-WIDE ADOPTION

= -

WHY SWITCH?

1 pound = 16 ounces

WHY SWITCH?

12 inches = 1 foot

3 ft = 1 yard

1760 yards = 1 mile

WHY SWITCH?

1 kilometer = 1000 meters1 meter = 1000 millimeters

1 kilogram = 1000 grams1 gram = 1000 milligrams

1 kilosecond = 1000 seconds1 second = 1000 milliseconds

BASE UNITS

mass(kilograms)

length(meters)

temperature(Kelvins)

electric current(amperes)

time(seconds)

DERIVED UNITS

x

x x

=

=

x x=

SI UNIT NAMES

[PREFIX] [BASE]

centi- gram

milli- second

kilo- meter

What it measures

Howmuch

mass

time

length

1/100

1/1000

1000

SI UNITS & SCIENTIFIC NOTATION

3.14 × 1012 meters

3,140,000,000,000 meters

3.14 Tm

SI UNITS & SCIENTIFIC NOTATION

8.12 × 10-9 seconds

0.00000000812 seconds

8.12 ns

SI UNITS & SCIENTIFIC NOTATION

PREFIX SYMBOL SCIENTIFIC NOTATION

SCALE

giga- G E 9 (x 109) 1,000,000,000

mega- M E 6 (x 106) 1,000,000

kilo- k E 3 (x 103) 1,000

hecto- h E 2 (x 102) 100

deka- D E 1 (x 101) 10

base - - 1

deci- d E -1 (x 10-1) 0.1

centi- c E -2 (x 10-2) 0.01

milli- m E -3 (x 10-3) 0.001

micro- μ E -6 (x 10-6) 0.000001

nano- n E -9 (x 10-9) 0.000000001

CONVERTING FROM SI TO SN

Convert 20 mm to m:

• = 20 x 10-3m

Convert 400s to ns:

• = 400 x 109ns

Convert the following:

1. 33 km to m

2. 42.5 Dg to g

3. 38,000,000,000 s to Gs

4. 9.8 x 103 mm to m

5. 303.9 cK to K

GUIDED PRACTICE

1. Be able to write the entire SI Unit Conversion Chart from memory (available on Moodle)

2. Be able to convert to and from Base SI Units

3. Be able to convert from Scientific Notation to SI Units

4. Be able to add, subtract, multiply, and divide in Scientific Notation

(Get with a partner and start studying the SI Unit Conversion Chart)

QUIZ TOMORROW