Measurement Examples And Worksheet - A-64 Appendix 5 Page 28
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36A-90
Appendix V Measurement
V.3
S E C T I O N
Objectives
Converting between American and Metric Units
1
Use unit conversion factors to
convert between American
and metric units.
It is often necessary to convert between American units and metric units. For example,
2
Convert between Fahrenheit
we must convert units to answer the following questions.
and Celsius temperatures.
•
Which is higher: Pikes Peak (elevation 14,110 feet) or the Matterhorn
(elevation 4,478 meters)?
•
Does a 2-pound tub of butter weigh more than a 1-kilogram tub?
•
Is a quart of soda pop more or less than a liter of soda pop?
In this section, we discuss how to answer such questions.
Use unit conversion factors to convert
1
between American and metric units.
The following table shows some conversions between American and metric units of
length. In all but one case, the conversions are rounded approximations. An
symbol
is used to show this. The one exact conversion in the table is 1 inch = 2.54 centimeters.
Equivalent Lengths
1 2 3 4 5 6 7 8 9 10 11 12
American to metric
Metric to American
1 foot
1 in.
2.54 cm
1 cm
0.39 in.
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
1 ft
0.30 m
1 m
3.28 ft
1 yard
1 yd
0.91 m
1 m
1.09 yd
10
20
30
40
50
60
70
80
90
100
1 mi
1.61 km
1 km
0.62 mi
1 meter
Unit conversion factors can be formed from the facts in the table to make specific
conversions between American and metric units of length.
Self Check 1
1
EXAMPLE
Clothing Labels
The
figure
Refer to the
CLOTHING LABELS
shows a label sewn into some pants made in Mexico that
WAIST: 82 cm
figure in Example 1. What is the
are for sale in the United States. Express the waist size to
INSEAM: 76 cm
inseam length, to the nearest
the nearest inch.
RN-80811
inch?
SEE REVERSE FOR CARE
Strategy
We will multiply 82 centimeters by a carefully
MADE IN
Now Try
Problem 13
chosen unit conversion factor.
MEXICO
WHY
If we multiply by the proper unit conversion factor,
we can eliminate the unwanted units of centimeters and
convert to inches.
Solution
To convert from centimeters to inches, we must choose a unit conversion factor
whose numerator contains the units we want to introduce (inches), and whose
denominator contains the units we want to eliminate (centimeters). From the first
row of the Metric to American column of the table, we see that there is
approximately 0.39 inch per centimeter. Thus, we will use the unit conversion
factor:
0.39 in.
This is the unit we want to introduce.
This is the unit we want to eliminate (the original unit).
1 cm
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