physics.units

Various units-related things

This module has a soft dependency on the pint units library. Please import this module only conditionally or only if you can accept a pint dependency.

`FwmuMixin`()	Mixing for frequency/wavelength/wavenumber neutrality
`SRF`(f, W)	Respresents a spectral response function
`density`(p, T[, R])	Wrapper around `typhon.physics.atmosphere.density()`.
`planck_f`(f, T)	Planck law expressed in frequency.
`radiance_units`	dict() -> new empty dictionary dict(mapping) -> new dictionary initialized from a mapping object's (key, value) pairs dict(iterable) -> new dictionary initialized as if via: d = {} for k, v in iterable: d[k] = v dict(**kwargs) -> new dictionary initialized with the name=value pairs in the keyword argument list. For example: dict(one=1, two=2).
`specrad_frequency_to_planck_bt`(L, f)	Convert spectral radiance per frequency to brightness temperature
`specrad_wavenumber2frequency`(specrad_wavenum)	Convert spectral radiance from per wavenumber to per frequency
`ureg`	The unit registry stores the definitions and relationships between units.

physics.units.constants

Collection of physical constants and conversion factors.

The magnitudes of the defined constants are taken from typhon.constants.

This module adds units defined with pint’s UnitRegistry..

Physical constants

`g`	Earth standard gravity
`h`	Planck constant
`k`	Boltzmann constant
`c`	Speed of light
`N_A`	Avogadro constant
`R`	Universal gas constant
`molar_mass_dry_air`	Molar mass for dry air
`molar_mass_water`	Molar mass for water vapor
`gas_constant_dry_air`	Gas constant for dry air
`gas_constant_water_vapor`	Gas constant for water vapor

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
`earth_radius`	Earth radius
`atm`	Standard atmosphere

physics.units.tools

Miscellaneous unit-aware tools

UnitsAwareDataArray(data, coords, dims, ...)

Like xarray.DataArray, but transfers units