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Chapter 4: Constants and Measurement Units 89
04UNITS DOC TI
-
89/92Plus: Constants and Measurement Units (English) SusanGullord Revised:02/23/01 10:54 AM Printed: 02/23/01 2:12 PM Page 89 of 12
The
SI
and
ENG/US
systems of measurement use built-in default
units. In this section, the built-in defaults are indicated by
(SI)
and
(ENG/US)
. In some categories, both systems use the same default.
For a description of the
NONE
default, refer to page 87. Notice that
some categories do not have default units.
_c ............speed of light .......................2.99792458
E
8_m/_s
_Cc..........coulomb constant ...............8.9875517873682
E
9_N
ø
_m
2
/_coul
2
_g ............acceleration of gravity........9.80665_m/_s
2
_Gc .........gravitational constant.........6.67259
E
ë
11_m
3
/_kg/_s
2
_h............Planck’s constant................6.6260755
E
ë
34_J
ø
_s
_k............Boltzmann’s constant.........1.380658
E
ë
23_J/_°K
_Me.........electron rest mass...............9.1093897
E
ë
31_kg
_Mn.........neutron rest mass ...............1.6749286
E
ë
27_kg
_Mp.........proton rest mass .................1.6726231
E
ë
27_kg
_Na .........Avogadro’s number.............6.0221367
E
23 /_mol
_q ............electron charge....................1.60217733
E
ë
19_coul
_Rb .........Bohr radius..........................5.29177249
E
ë
11_m
_Rc..........molar gas constant..............8.31451_J/_mol/_
¡
K
_Rdb .......Rydberg constant................10973731.53413 /_m
_Vm.........molar volume.......................2.241409
E
ë
2_m
3
/_mol
_
H
0...........permittivity of a vacuum......8.8541878176204
E
ë
12_F/_m
_
s
............Stefan-Boltzmann constant..5.6705119
E
ë
8_W/_m
2
/_
¡
K
4
_
f
0 ..........magnetic flux quantum.......2.0678346161
E
ë
15_Wb
_
m
0..........permeability of a vacuum ....1.2566370614359
E
ë
6_N/_A
2
_
m
b..........Bohr magneton....................9.2740154
E
ë
24_J
ø
_m
2
/_Wb
_Ang .......angstrom
_au..........astronomical unit
_cm.........centimeter
_fath .......fathom
_fm..........fermi
_ft............foot
(ENG/US)
_in...........inch
_km.........kilometer
_ltyr ........light year
_m...........meter
(SI)
_mi..........mile
_mil.........1/1000 inch
_mm........millimeter
_Nmi.......nautical mile
_pc ..........parsec
_rod.........rod
_yd ..........yard
_
m
............micron
_
A
¡
............angstrom
_acre.......acre
_ha..........hectare
NONE
(SI) (ENG/US)
List of Pre-Defined Constants and Units
This section lists the pre-defined constants and units by
category. You can select any of these from the UNITS dialog
box. If you use
3
to set default units, note that categories
with only one defined unit are not listed.
Defaults for SI and
ENG/US
Constants
Note: The
TI
-
89 / TI
-
92 Plus
simplifies unit expressions
and displays results
according to your default
units. Therefore, constant
values displayed on your
screen may appear different
from the values in this table.
Tip: For Greek characters,
refer to Shortcut Keys
(inside front and back
covers).
Length
Area