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