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TM 9-254
CHAPTER 5
MEASUREMENT AND MECHANICAL DATA
Section I. MEASUREMENT DATA
5-1.
U.S. and Metric Measurement Data.
a.
U.S. Measurement System. In the U.S. System, fundamental units are the inch, foot, second, and pound.
The U.S. System has its origins in the British System, but they are not identical.
b.
Metric Measurement System. In the Metric System the fundamental units are the they are not identical.
meter and the kilogram. The Metric system is the most widely used system and the system used almost exclusively for
scientific work.
5-2.
Metric Prefixes
The basic prefixes used in the Metric System are listed in table 5-1.
Table 5-1. Metric Prefixes
Whole numbers
Multiple
Prefix
Abbreviation
1,000,000,000,000
1012
tera
T
1,000,000,000
109
giga
G
1,000,000
106
mega
M
10,000
104
myria
My
1,000
103
kilo
K
100
102
hecto
H
1
10
deka
D
.1
10-1
deci
d
.01
10-2
centi
c
.001
10-3
milli
m
.000001
10-6
micro
u
.000000001
10-9
nano
n
.000000000001
10-12
pico
p
.000000000000001
10-15
femto
f
.000000000000000001
10-18
atto
a
5-1
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