Constants and Measurement Units 279
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
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
Description Value
_c speed of light 2.99792458E8_m/_s
_Cc coulomb constant
8.9875517873682E9_N
ø_m
2–
/_coul
2
_g acceleration of gravity
9.80665_m/_s
2
_Gc gravitational constant
6.67259E
‘M11_m
3
/_kg/_s
2
_h Planck’s constant
6.6260755E
‘M34_Jø_s
_k Boltzmann’s constant
1.380658E‘M23_J/_¡K
_Me electron rest mass
9.1093897E‘M31_kg
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