1. Metric System

2. SI System Standard International System of measurement – metrics
Has seven base units and many other units derived from these seven

3. Seven Base Units Quantity Unit Abbreviation length meter m mass gram g
time
second s
temperature
kelvin K
amount
mole
mol
current
ampere
amp
intensity
candela cd

4. Mass vs Weight Mass is not the same as weight
Mass is the amount of matter in a substance
Weight is a measure of the pull of gravity on the substance
Can you be weightless? Can you be massless?

5. Derived Units
Many other units are used in the metric system, but they are combinations of the base units
Speed - meter per sec (m/sec)
Volume
volume = length x width x height
(m) x (m) x (m) = m3
.001 m3 = 1 liter (L)
1 cm3 = 1ml

6. Prefixes
Metric system utilizes prefixes which indicate multiples of 10 of the unit
kilo k 1000
hecto- h 100
deka da 10
deci d .1
centi c .01
milli m

7. Converting Between Metric Units
3.65 dam = __________cm
2587 mm = __________hm
.0087 hl = __________cl

8. More Prefixes
Mega- M 106
Micro- u 10-6
Nano - n 10-9
Pico- p

9. Use the appropriate prefixes
3 x 106 L
15 x 10-9 g
8 x 108 m
3.5 x 10-6 L
1.46 x 1010 g

10. Temperature Metric unit – Kelvin – not used for measurement
Measured in C (celsius)
K = C
Old system is F (farenheit)
C = 5/9 (F -32)
What is 69 F in C and K?

11. Temperature is an intensive property- does not depend on the amount
Extensive properties do depend on the amount
In the statement “a yellow sample is solid at 25 C. It weighs 6.0g and has a density of 2.3g/cm3” what are the intensive and extensive properties?