1. SI units, prefixes, and values P. Perkerson

2. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
length
time
temperature
amount of substance

3. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
gram or kilogram g kg
length
meter m
time
second s
temperature
kelvin K
amount of substance

4. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
gram or kilogram g kg
balance
length
meter m
time
second s
temperature
kelvin K
amount of substance

5. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
gram or kilogram g kg
balance
length
meter m
ruler
time
second s
temperature
kelvin K
amount of substance

6. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
gram or kilogram g kg
balance
length
meter m
ruler
time
second s
watch or clock
temperature
kelvin K
amount of substance

7. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
gram or kilogram g kg
balance
length
meter m
ruler
time
second s
watch or clock
temperature
kelvin K
thermometer
amount of substance

8. International System of Units – Base Units (Page 130)
Quantity
Unit name
Unit Symbol
Measuring Instrument
mass
gram or kilogram g kg
balance
length
meter m
ruler
time
second s
watch or clock
temperature
kelvin K
thermometer
amount of substance
mole
mol
can’t be measured directly

9. SI prefixes giga mega M kilo k name symbol meaning ratio to base unit
1 million 106
kilo k
1 thousand 103

10. SI prefixes giga G mega M kilo k name symbol meaning
ratio to base unit
giga G
1 billion
109
mega M
1 million 106
kilo k
1 thousand 103

11. SI prefixes giga G mega M kilo k name symbol meaning
ratio to base unit
giga G
1 billion
109
109 base units 1 giga unit
mega M
1 million 106
106 base units
1 mega unit
kilo k
1 thousand 103
103 base units
1 kilo unit

12. SI prefixes deci d centi c milli m name symbol meaning
ratio to base unit
deci d
1 tenth (0.1)
10-1
centi c
1 hundredth
(0.01)
10-2
milli m
1 thousandth
(0.001)
10-3

13. SI prefixes deci d centi c milli m name symbol meaning
ratio to base unit
deci d
1 tenth (0.1)
10-1
10 deci units 1 base unit
centi c
1 hundredth
(0.01)
10-2
100 centi units
1 base unit
milli m
1 thousandth
{0.001)
10-3
1000 milli units

14. SI prefixes micro  nano n pico p name symbol meaning
ratio to base unit
micro 
1 millionth
10-6
nano n
1 billionth
10-9
pico p
1trillionth
10-12

15. SI prefixes micro  nano n pico p name symbol meaning
ratio to base unit
micro 
1 millionth
10-6
106 micro units 1 base unit
nano n
1 billionth
10-9
109 nano units
1 base unit
pico p
1trillionth
10-12
1012 pico units

16. Derived units Derived from base units
Volume is derived from length base unit
V = l x w x h
V = length unit cubed = m3

17. Volume
m3 is not a very handy unit – especially if you are dealing with liquids
“new” derived unit liter (L)

18. Liter definitions 1000 L = 1 m3 1 L = 1m3/1000 1 L = 1 dm3
1 mL = 1 cm3 = 1cc

19. Density is also a derived unit – D = M/V Pure water has a density of 1 g/mL (at room temperature)

20. What are units based on?
Meter: since 1983, based on distance traveled by light in 1/299,792,458 sec.
Kilogram: mass of 1 cubic decimeter of water.

21. Second: old -1/86,400 of a solar day – now – The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

22. Kelvin: unit of thermodynamic temperature, is the fraction 1/273
Kelvin: unit of thermodynamic temperature, is the fraction 1/ of the thermodynamic temperature of the triple point of water.

23. Mole: the amount of substance of a system which contains as many elementary entities as there are atoms in kilogram of carbon 12; its symbol is "mol." One mole is equal to 6.02 X 1023 “things”.