constants

Collection of physical constants and conversion factors.

Physical constants

g

Earth standard gravity in ms2

h

Planck constant in Js

k

Boltzmann constant in JK1

c

Speed of light in ms1

N_A

Avogadro constant in mol1

K, zero_celsius

Kelvin at 0 Celsius

triple_point_water

Triple point temperature of water K

R

Universal gas constant in Jmol1K1

molar_mass_dry_air

Molar mass for dry air in kgmol1

molar_mass_water

Molar mass for water vapor in kgmol1

gas_constant_dry_air

Gas constant for dry air in JK1kg1

gas_constant_water_vapor

Gas constant for water vapor in JK1kg1

isobaric_mass_heat_capacity

Specific heat capacity in Jkg1K1

heat_of_vaporization

Heat of vaporization in Jkg1

Mathematical constants

golden

Golden ratio

SI prefixes

yotta

1024

zetta

1021

exa

1018

peta

1015

tera

1012

giga

109

mega

106

kilo

103

hecto

102

deka

101

deci

101

centi

102

milli

103

micro

106

nano

109

pico

1012

femto

1015

atto

1018

zepto

1021

Non-SI ratios

ppm

106 parts per million

ppb

109 parts per billion

ppt

1012 parts per trillion

Binary prefixes

kibi, KiB

210

mebi, MiB

220

gibi

230

tebi

240

pebi

250

exbi

260

zebi

270

yobi

280

KB

103

MB

106

Earth characteristics

earth_mass

Earth mass in kg

earth_radius

Earth radius in m

atm

Standard atmosphere in Pa