Man page of units
Section: User Commands (1)
Return to Main Contents
units - Converts units from one measure to another
units [-] [file]
command converts quantities expressed in
one measurement to their equivalents in another. The
command is an interactive command. It prompts you for the unit you want to
convert from and the unit you want to convert to. The
command does multiplicative scale changes only. That is,
can convert from one value to another only when the conversion is done with
a multiplication factor. For example,
between degrees Fahrenheit and degrees Celsius because the value of 32 must
be added or subtracted in the conversion.
You can specify a quantity as a multiplicative combination of units,
optionally preceded by a numeric multiplier.
Indicate powers by entering suffixed positive integers and indicate
division with a
as a unit of mass, but considers
to be the British
pound sterling. Compound names are run together (for example,
lightyear). Prefix British units differing from their American
file contains a complete list
of the units that the
Most familiar units, abbreviations, and metric prefixes are recognized
command, together with the following:
Ratio of circumference to diameter.
Speed of light.
Charge on an electron.
Acceleration of gravity.
Pressure head per unit height of water.
display a list of all known units and their conversion values. The
argument specifies an alternative
file to be used instead of the default file
To start the
Now you can try the following examples.
To display conversion factors, enter:
you have: in
you want: cm
The output from the
command tells you to multiply
the number of inches by 2.540000e+00 to get centimeters, and to multiply the
number of centimeters by 3.937008e-01 to get inches.
These numbers are in standard exponential notation, so 3.937008e-01
means 3.937008 x 10-1, which is the same as 0.3937008. The second number
is always the reciprocal of the first; for example, 2.54 equals 1/0.3937008.
To convert a measurement to different units, enter:
you have: 5 years
you want: microsec
The output shows that 5 years equals 1.577846 x 1014 microseconds, and
that 1 microsecond equals 6.337753 x 10-15 years.
To give fractions in measurements, enter:
you have: 1|3 mi
you want: km
(vertical bar) indicates division, so 1|3 means
one-third. This shows that one-third mile is the same as 0.536448 kilometers.
To include exponents in measurements, enter:
you have: 1.2-5 gal
you want: floz
The expression 1.2-5 gal is the equivalent of 1.2 x 10-5. Do not type
an e before the exponent. This example shows that 1.2 x 10-5 (0.000012) gallons
equal 1.536 x 10-3 (0.001536) fluid ounces.
To specify complex units, enter:
you have: gram centimeter/second2
you want: kg-m/sec2
The units gram centimeter/second2 mean "grams x centimeters/second2."
Similarly, kg-m/sec2 means "kilograms x meters/sec2," which is often read
as "kilogram-meters per seconds squared".
If the units you specify after you have and you want are incompatible,
you have: ft
you want: lb
means the units you specified
cannot be converted. Feet measure length, and pounds measure mass, so converting
from one to the other does not make sense. Therefore, the
command displays the equivalent of each value in standard units.
In other words, this example shows that 1 foot equals 0.3048 meters
and that 1 pound equals 0.4535924 kilograms. The
command shows the equivalents in meters and kilograms because the command
considers these units to be standard measures of length and mass.
causes you to exit from the
Contains units and their conversion values.
This document was created by
using the manual pages.
Time: 02:43:05 GMT, October 02, 2010