You have:
inch
You want:
cm
* 2.54000e+00
/ 3.93701e-01
A quantity is specified as a multiplicative combination of
units optionally preceded by a numeric multiplier.
Powers are indicated by suffixed positive integers,
division by the usual sign:
You have:
15 pounds force/in2
You want:
atm
* 1.02069e+00
/ 9.79730e-01
Units
only does multiplicative scale changes.
Thus it can convert Kelvin to Rankine, but not Centigrade to
Fahrenheit.
Most familiar units,
abbreviations, and metric prefixes are recognized,
together with a generous leavening of exotica
and a few constants of nature including:
pi ratio of circumference to diameter
c speed of light
e charge on an electron
g acceleration of gravity
force same as g
mole Avogadro's number
water pressure head per unit height of water
au astronomical unit
`Pound' is a unit of
mass.
Compound names are run together, e.g. `lightyear'.
British units that differ from their US counterparts
are prefixed thus: `brgallon'.
Currency is denoted `belgiumfranc', `britainpound', ...
For a complete list of units, `cat /usr/lib/units'.