M

0.000001 (10-6)

nano

n

0.000000001 (10-9)

pico

p

0.000000000001 (10-12)

TABLE 1-3 Some Derived and Other Units

Base and Other Units

The SI has seven fundamental base units that describe length, mass, time, and other quantities, as shown in Table 1-1. Multiples of a base unit (in powers of 10) are designated by prefixes, as shown in Table 1-2. For example, the base unit for length is the meter. One kilometer (km) is equal in length to 1,000 meters (m).

Although the base units in Table 1-1 are extremely useful, they can't be applied to certain measurements, such as surface area or velocity. Scientists use other important units called derived units for these types of quantities. Derived units are produced by the mathematical relationship between two base units or between two derived units. Table 1-3 shows some common derived units. There are some additional units of measurement that are not part of the SI but that can be used with SI units such as units of time, volume, and mass, as shown in Table 1-3.

TABLE 1-3 Some Derived and Other Units

Quantity

Name

Abbreviation

Area

square meter

m2

Volume

cubic meter

m3

Density

kilogram per cubic meter

kg/m3

Specific volume

cubic meter per kilogram

m3/kg

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