Constants and Measurement Units 293
List of Pre-Defined Constants and UnitsList of Pre-Defined Constants and UnitsList of Pre-Defined Constants and UnitsList 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
Defaults for SI and ENG/USDefaults for SI and ENG/US
Defaults for SI and ENG/US
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.
Some categories do not have default units.
Constants
ConstantsConstants
Constants
Description Value
_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 6.6742E‘M11 _m3/_kg/_s2
_h Planck’s constant 6.6260693E‘M34_Jø_s
_k Boltzmann’s constant 1.380650 5E‘M23_J/_¡K
_Me electron rest mass 9.1093826E‘M31_kg