Appendix c units – HP 49g Graphing Calculator User Manual
Page 211
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Appendix C
Units
The HP 49G contains a catalog of 127 units that you can use to create unit
objects. A imit object is a real number linked to a unit expression by the
underscore character. For example, 2„in is a unit object representing 2
inches.
The calculator’s imits are based on the 7 base mrits of the International
System of Units: m (meter), kg (kilogram), s (second), A (ampere), K
(keMn), cd (candela), and mol (mole). The HP 49G makes use of two
additional base imits: r (radian) and sr (steradian). The remaining 118
imits are compoimd units, that is, units derived from the 9 base units.
You select a imit by pressing (n (UNITS), choosing the appropriate category
from the Units menu—length, area, volume, etc.—and finally selecting the
unit from the category submenu. You do this when creating a unit object
or when converting one unit to another. You can also perform calculations
using unit objects. (See Advanced User’s Guide at
for more infonuation.)
Unit (Full Name)
Value in SI Units
a(are)
100 nU
A (ampere)
1 A
acre (acre)
4046.87260987 m^
arcmin (minute of arc)
2.90888208666 xlO^ r
arcs (second of arc)
4.8481368111 X 10-6 r
atm (atmosphere)
101325 kg/m-s2
ail (astronomical unit)
1.495979 X 10" m
À (angstrom)
1 X 10-^6 m
b (bam)
1 X 10-26 j.^2
bar (bar)
100000 kg/m-s2
Units
Page C-1