Texas Instruments TITANIUM TI-89 - Manual (Page 285)

Constants and Measurement Units 285
If an expression uses a combination of units, you can specify a conversion for some of
the units only. Any units for which you do not specify a conversion will be displayed
according to your defaults.
To convert 186000 miles/second from miles to
kilometers:
186000_mi/_s 4 _km
To convert 186000 miles/second from
seconds to hours:
186000_mi/_s 4 1/_hr
To enter meters per second squared:
27_m/_s^2
To convert meters per second squared from
seconds to hours:
27_m/_s^2 4 1/_hr^2
Because a Time
conversion is not
specified, it is shown
in its default unit (_s
in this example).
Because a Length
conversion is not
specified, it is shown
in its default unit (_m
in this example).