General Tables of Units of Measurement
C-1
Appendix C
General Tables of Units of Measurement
These tables have been prepared for the benefit of those requiring tables of units for occasional ready reference.
In
Section 4 of this Appendix, the tables are carried out to a large number of decimal places and exact values are indicated
by underlining.
In most of the other tables, only a limited number of decimal places are given, therefore making the
tables better adopted to the average user.
1.
TABLES OF METRIC UNITS OF MEASUREMENT
In the metric system of measurement, designations of multiples and subdivisions of any unit may be arrived at by
combining with the name of the unit the prefixes deka
, hecto
, and kilo
meaning, respectively, 10, 100, and 1 000, and
deci
, centi
, and milli
, meaning, respectively, one-tenth, one-hundredth, and one- thousandth. In some of the following
metric tables, some such multiples and subdivisions have not been included for the reason that these have little, if any
currency in actual usage.
In certain cases, particularly in scientific usage, it becomes convenient to provide for multiples larger than 1 000 and
for subdivisions smaller than one-thousandth.
Accordingly, the following prefixes have been introduced and these are
now generally recognized:
yotta,
(Y)
meaning 10
deci,
(d),
meaning 10
24
-1
zetta,
(Z),
meaning 10
centi,
(c),
meaning 10
21
-2
exa,
(E),
meaning 10
milli,
(m),
meaning 10
18
-3
peta,
(P),
meaning 10
micro,
(μ),
meaning 10
15
-6
tera,
(T),
meaning 10
nano,
(n),
meaning 10
12
-9
giga,
(G),
meaning 10
pico,
(p),
meaning 10
9-
1
2
mega,
(M),
meaning 10
femto,
(f),
meaning 10
6-
1
5
kilo,
(k),
meaning 10
atto,
(a),
meaning 10
3-
1
8
hecto,
(h),
meaning 10
zepto,
(z),
meaning 10
2-
2
1
deka,
(da),
meaning 10
yocto,
(y),
meaning 10
1-
2
4
Thus a kilometer is 1000 meters and a millimeter is 0.001 meter.
Units of Length
10
millimeters (mm)
= 1 centimeter (cm)
10
centimeters
= 1 decimeter (dm) = 100 millimeters
10
decimeters
= 1 meter (m) = 1000 millimeters
10
meters
= 1 dekameter (dam)
10
dekameters
= 1 hectometer (hm) = 100 meters
10
hectometers
= 1 kilometer (km)
= 1000 meters