Transcript Document

Metric
Measurement
I. The Metric System: Consist of seven
standard units and prefixes that represent
powers of ten. The version of used today is
the International System of Units or SI.
A. Prefixes
Factor
Word
Factor
Number
Prefix
Symbol
Thousands
Hundreds
Tens
Basic
unit
Tenths
Hundredths
Thousandths
1000
100
10
1
0.1
0.01
0.001
Meter
Gram
Liter
deci-
centi-
milli-
d
c
m
kilo-
hecto-
deca-
k
h
da
1. Length: distance from one point to
another.
 unit = meter
 symbol = m
 instrument = meter stick.
2.Volume is the amount of space an
object takes up.
a. Liquid Volume = unit liter, symbol = L,
instrument = graduated cylinder.
b. Read bottom of the meniscus curve
c. Volume of regular shaped objects use a
metric ruler and measure the
2cm
10cm
25cm
25 X 10 X 2 = 500cm3
d. Volume of irregular shaped objects
like stones use graduated cylinder.
25
20
Volume is 5 cm3
10 cm
12 cm
What is the volume of water?
What is the volume of this
block?
3.Mass amount of matter an object has.
Unit = Gram
Symbol = g
Instrument = Triple Beam Balance
4.Density is the amount of mass in a certain
volume. The unit = g/ml or g/cm3
mass
volume
a. Density = the mass divided by the volume
Density = mass/volume
D = m/v
aluminum
r
U
Example: What is the density of a 270g
M
piece of aluminum that has a volume of
10cm3?
B
270/10 = 27g/cm3
5. Limits of measurements possible
reasons for different
measurements.
1. Human error.
2. Instruments can only measure to a
certain level of accuracy.
3. There is no perfect measuring
instrument.