constants

Collection of physical constants and conversion factors.

Physical constants

g	Earth standard gravity in \(\sf ms^{-2}\)
h	Planck constant in \(\sf Js\)
k	Boltzmann constant in \(\sf JK^{-1}\)
c	Speed of light in \(\sf ms^{-1}\)
N_A	Avogadro constant in \(\sf mol^{-1}\)
K, zero_celsius	Kelvin at 0 Celsius
triple_point_water	Triple point temperature of water \(\sf K\)
R	Universal gas constant in \(\sf J mol^{-1}K{^-1}\)
molar_mass_dry_air	Molar mass for dry air in \(\sf kg\,mol^{-1}\)
molar_mass_water	Molar mass for water vapor in \(\sf kg\,mol^{-1}\)
gas_constant_dry_air	Gas constant for dry air in \(\sf J K^{-1} kg^{-1}\)
gas_constant_water_vapor	Gas constant for water vapor in \(\sf J K^{-1} kg^{-1}\)
isobaric_mass_heat_capacity	Specific heat capacity in \(\sf J kg^{-1} K^{-1}\)
heat_of_vaporization	Heat of vaporization in \(\sf J kg{^-1}\)

Mathematical constants

golden

Golden ratio

SI prefixes

yotta	\(10^{24}\)
zetta	\(10^{21}\)
exa	\(10^{18}\)
peta	\(10^{15}\)
tera	\(10^{12}\)
giga	\(10^{9}\)
mega	\(10^{6}\)
kilo	\(10^{3}\)
hecto	\(10^{2}\)
deka	\(10^{1}\)
deci	\(10^{-1}\)
centi	\(10^{-2}\)
milli	\(10^{-3}\)
micro	\(10^{-6}\)
nano	\(10^{-9}\)
pico	\(10^{-12}\)
femto	\(10^{-15}\)
atto	\(10^{-18}\)
zepto	\(10^{-21}\)

Non-SI ratios

ppm	\(10^{-6}\) parts per million
ppb	\(10^{-9}\) parts per billion
ppt	\(10^{-12}\) parts per trillion

Binary prefixes

kibi, KiB	\(2^{10}\)
mebi, MiB	\(2^{20}\)
gibi	\(2^{30}\)
tebi	\(2^{40}\)
pebi	\(2^{50}\)
exbi	\(2^{60}\)
zebi	\(2^{70}\)
yobi	\(2^{80}\)

KB	\(10^3\)
MB	\(10^6\)

Earth characteristics

earth_mass	Earth mass in \(\sf kg\)
earth_radius	Earth radius in \(\sf m\)
atm	Standard atmosphere in \(\sf Pa\)