The document discusses the International System of Units (SI), which provides standardized measurement units. It defines measurement as consisting of a number and a unit. The seven base SI units are defined for mass, length, time, temperature, current, amount of substance, and luminous intensity. Prefixes are used to denote multiples and submultiples of units, making conversions simple by moving the decimal point. Examples show converting between liters and milliliters, milligrams and grams, and kilograms to milligrams.

1. The SI System of Measurement

2. The Nature of Measurement
Part 1 - number
Part 2 - scale (unit)
Examples:
20 grams
6.63 x 10-34 Joule·seconds
A Measurement is a quantitative
observation consisting of TWO parts

3. The Fundamental SI Units
(le Système International, SI)
Physical Quantity Name Abbreviation
Mass kilogram kg
Length meter m
Time second s
Temperature Kelvin K
Electric Current Ampere A
Amount of Substance mole mol
Luminous Intensity candela cd

4. SI Prefixes
Common to Chemistry
Prefix Unit Abbr. Exponent
Kilo k 103
Deci d 10-1
Centi c 10-2
Milli m 10-3
Micro  10-6

5. Metric Conversions
g
m
L 10-1 10-2 10-3101102103
Base
unit
deci centi millidekahectokilo
Conversions in the metric system are
merely a matter of moving a decimal point.
The “base unit” means the you have a
quantity (grams, meters, Liters, etc without
a prefix.

6. Metric Conversions
g
m
L 10-1 10-2 10-3101102103
Base
unit
deci centi millidekahectokilo
Example #1: Convert 18 liters to milliliters
18 L
1 2 3
18 liters = 18 000 milliliters

7. Metric Conversions
g
m
L 10-1 10-2 10-3101102103
Base
unit
deci centi millidekahectokilo
Example #2: Convert 450 milligrams to grams
123
450 mg450 mg = 0.450 g

8. Metric Conversions
g
m
L 10-1 10-2 10-3101102103
Base
unit
deci centi millidekahectokilo
Example #3: Convert 20 kilograms to milligrams
20 kg
1 2 3 4 5 6
20 kg = 20 000 000 mg