Transcript Units of Measurement

Units of Measurement
SI – Le Systeme International
d’Unites
AKA: the Metrics System
SI Base Units
Adopted: 1960
Standard international measurement
Powers of Ten
Mass vs. Weight
Mass measures the
quantity of matter
Standard unit = g
(gram)
Instrument =
Balance
Weight measures
the gravitational pull
on matter
Standard unit = N

Newton is force
Instrument = Spring
Scale
Length
Distance measurement
Standard unit = m (meter)
Instrument = Ruler
Volume
Amount of space occupied by an object
For non-liquid volumes, standard
unit = m3
For liquid volumes, standard unit = L
(liter)
1 mL = 1 cm3
Instrument = graduated cylinders or
ruler
Temperature
Standard unit = Celsius
Using Celsius, water freezes at 0
degrees, and boils at 100 degrees
F = 9/5C + 32
C = 5/9 (F – 32)
Conversions and Scale
Larger ----------------------Smaller
(k)
(h)
(da)
(d)
(c)
(m)
kilo
hecto
deca
deci
centi
milli
Length
km
hm
dam
m dm
cm
mm
Mass
kg
hg
dag
g dg
cg
mg
Liquid
Volume
kL
hL
daL
L dL
cL
mL
Ladder Method
1
2
KILO
1000
Units
3
HECTO
100
Units
DEKA
10
Units
DECI
0.1
Unit
Meters
Liters
Grams
How do you use the “ladder” method?
1st – Determine your starting point.
2nd – Count the “jumps” to your ending point.
3rd – Move the decimal the same number of
jumps in the same direction.
CENTI
0.01
Unit
MILLI
0.001
Unit
4 km = _________ m
Starting Point
Ending Point
How many jumps does it take?
4. __. __. __. = 4000 m
1
2
3
Conversion Practice
Try these conversions using the ladder method.
1000 mg = _______ g
1 L = _______ mL
160 cm = _______ mm
14 km = _______ m
109 g = _______ kg
250 m = _______ km
Compare using <, >, or =.
56 cm
6m
7g
698 mg
Compare using <, >, or =.
25) 63 cm
26) 536 cm
6m
53.6 dm
27) 5 g
28) 43 mg
508 mg
5g
29) 1,500 mL
30) 3.6 m
1.5 L
36 cm