HP 48G - Page 19

To attach, convert or combine physical units of mea-
surement, use the application:
To attach a unit object to a real number (or another
unit) object, just press the desired unit's menu key.
This multiplies the given object by the desired unit.
Example: To form £.5%_cm (“2.54 centimeters”),
press (2] [5]4) (] WIEIEI
To attach the inverse of a unit object to a real num-
ber (or another unit) object, press (=) and the desired
unit’s menu key. This divides the given object by the
desired unit. Example: To form 1.2_"F-E (“1.8 de-
rees Rankine per Kelvin”), firstpress (1] - 8)(=UNITS)
B, then just press (> .
To convert a unit object to another (equivalent) unit,
press (&) and the desired unit's menu key. Example:
To convert 26. 21875 _mi (“26.21875 miles”) to kilo-
meters, firstpress(2) 6]~ |2 1]8)]7)5)[>)uns [EH
BTN, then (QIEEM. Result: 42.134338_km
Addition and subtraction of units require like dimen-
sions. The result units are those of the second argu-
ment. Example: To add 2 feetand 3inches, press (2)
(oJonims) (KT MG )M ) (result: 27_in).
But now reverse the arguments: (3)(=Junms) [T
1IN (result: Z.29_f1).
You can multiply or divide any mix of units just as in
real-number arithmetic. Examp/e To multiply 25 g by
8 ft/s2, you would press (2 G |
(&) onTs METHNEE -m TIHE
o/HEM. X. Result: THA_g#ft 3¢
To convert a mixed-units result to Sl base units,
you can use IBASE (available on the (<3[UNITS) menu).
Example: To convert ZHH_g#f1+3*Z (continuing
from the above example) to Sl base units, just press
(qIuNTS)IEEHET. Result: . HBEIE_|g#m-s7E
The COMVYERET command offers another way to con-
vert a unit to any equivalent unit: Given the original
unit, just key in the desired unit and use CONYERT .
Example: To convert . HEHIE _lg#m-5*F (continu-
ing fromthe above example) to the equivalent pounds
of force, key in 1_1bf and press (&unTs) T
Result: 1.37A43531714E-2_1bF *
*Thus you really have three ways to convert between equivalent units:
The ()-shifted (>JUNTS) menu items; the CONYERT command; and (a
quick trick) adding zero of the desired units (e.g. above: H_1bf ().
UNITS 17