Scientific Measurement C0L2P1

Scientific Measurement
C0L2P1
Essential
Questions
Measurement
and Scientific Tools
• In science what units are
internationally accepted?
• Why should you use significant
digits?
• How do I use the metric system?
Measurement
andSystem
Scientific
Tools
The
International
of Units
 The International System of Units (SI) is an
internationally accepted system for measurement.
 The International System of Units is the
modern form of the metric system, and is the
most widely used system of measurement.
Reasons why scientists use the International System
of Units (SI).?
 So all scientists regardless of what country they're
in can do the experiment and know how much of a
specific substance to use.
 So calculations done in one country could be
understood by a scientist living in another country.
Measurement
andSystem
Scientific
Tools
The
International
of Units
 All SI units are derived from seven base units.
The International System of Units (cont.)
 A prefix can be added
to a base unit’s name to
indicate either a
fraction or a multiple of
that base unit.
 Prefixes are based on
powers of ten, such as
0.01 and 100.
Measurement
and
Tools
Measurement
andScientific
Accuracy
 All measurements have some uncertainty.
 The tools used to make measurements limit
the accuracy of the measurements.
Measurement
and Digits
Scientific Tools
Significant
 Significant digits are the number of digits in a
measurement that are known with a certain degree of
reliability.
 The significant digits in a measurement include all digits
you know for certain plus one estimated digit.
Measurement
and Digits
Scientific Tools
Significant
Measurement
and Digits
Scientific Tools
Significant
(cont.)
Using significant digits lets others know how
certain your measurements are.
Measurement
and
Scientific Tools
Metric
System
The metric system is a measurement system based
on our decimal (base 10) number system.
Measurement
and
Scientific Tools
Metric
Prefixes
Prefix
Symbol
Factor Number
Factor Word
Kilo-
k
1000
Thousand
Hecto- h
100
Hundred
Deca-
da or dk
10
Ten
Unit
m, l, or g 1
One
Deci-
d
.1
Tenth
Centi-
c
.01
Hundredth
Milli-
m
.001
thousandth
Measurement
Scientific
Tools
Place Valuesand
of Metric
Prefixes
dm
dg
dL
cm
cg
cL
Thousandth
m
g
L
Hundredth
Tenth
dkm
dkg
dkL
One
hm
hg
hL
Ten
Hundred
Thousand
km
kg
kL
mm
mg
mL
Measurement
and
Scientific
Changing
Metric
Units Tools
To change from one unit to another in the metric system
you simply multiply or divide by a power of 10.
Measurement
Scientific
Tools
Place Value and
of Metric
Prefixes
Move the decimal point to
the right to multiply.
dm
dL
dg
cm
cL
cg
Thousandth
m
L
g
Hundredth
Tenth
dkm
dkL
dkg
One
hm
hL
hg
Ten
Hundred
Thousand
km
kL
kg
mm
mL
mg
Measurement
Scientific
Tools
Place Value and
of Metric
Prefixes
Move the decimal point to
the left to divide.
dm
dL
dg
cm
cL
cg
Thousandth
m
L
g
Hundredth
Tenth
dkm
dkL
dkg
One
hm
hL
hg
Ten
Hundred
Thousand
km
kL
kg
mm
mL
mg