Chapter 4: Constants and Measurement Units 89
04UNITSDOC TI
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89/92Plus:Constants and Measurement Units (English) SusanGullord Revised:02/23/01 10:54 AM Printed:02/23/01 2:12 PM Page89 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....................... 2.99792458E8_m/_s
_Cc..........coulomb constant ...............8.9875517873682E9_Nø_m2/_coul2
_g............ acceleration of gravity........9.80665_m/_s2
_Gc......... gravitational constant.........6.67259Eë11_m3/_kg/_s2
_h............Planck’s constant ................6.6260755Eë34_Jø_s
_k............Boltzmann’s constant .........1.380658Eë23_J/_°K
_Me.........electron rest mass............... 9.1093897Eë31_kg
_Mn.........neutron rest mass ...............1.6749286Eë27_kg
_Mp.........proton rest mass .................1.6726231Eë27_kg
_Na......... Avogadro’s number.............6.0221367E23 /_mol
_q............ electron charge....................1.60217733Eë19_coul
_Rb......... Bohr radius ..........................5.29177249Eë11_m
_Rc..........molar gas constant..............8.31451_J/_mol/_¡K
_Rdb.......Rydberg constant ................10973731.53413 /_m
_Vm.........molar volume.......................2.241409Eë2_m3/_mol
_H0...........permittivity of a vacuum......8.8541878176204Eë12_F/_m
_s............Stefan-Boltzmann constant..5.6705119Eë8_W/_m2/_¡K4
_f0.......... magnetic flux quantum.......2.0678346161Eë15_Wb
_m0..........permeability of a vacuum ....1.2566370614359Eë6_N/_A2
_mb..........Bohr magneton.................... 9.2740154Eë24_Jø_m2/_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