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Adding electron_rest_mass unit in physics.units #24463

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merged 2 commits into from Jan 10, 2023
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Adding electron_rest_mass unit in physics.units #24463

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2c5ce40
Adding electron_rest_mass unit
1e9abhi1e10 Jan 2, 2023
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1e9abhi1e10 Jan 10, 2023
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2 changes: 2 additions & 0 deletions sympy/physics/units/__init__.py
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Expand Up @@ -164,6 +164,7 @@
josephson_constant,
von_klitzing_constant,
Da, dalton, amu, amus, atomic_mass_unit, atomic_mass_constant,
me, electron_rest_mass,
gee, gees, acceleration_due_to_gravity,
u0, magnetic_constant, vacuum_permeability,
e0, electric_constant, vacuum_permittivity,
Expand Down Expand Up @@ -398,6 +399,7 @@ def find_unit(quantity, unit_system="SI"):
'josephson_constant',
'von_klitzing_constant',
'Da', 'dalton', 'amu', 'amus', 'atomic_mass_unit', 'atomic_mass_constant',
'me', 'electron_rest_mass',
'gee', 'gees', 'acceleration_due_to_gravity',
'u0', 'magnetic_constant', 'vacuum_permeability',
'e0', 'electric_constant', 'vacuum_permittivity',
Expand Down
2 changes: 2 additions & 0 deletions sympy/physics/units/definitions/__init__.py
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Expand Up @@ -82,6 +82,7 @@
josephson_constant,
von_klitzing_constant,
Da, dalton, amu, amus, atomic_mass_unit, atomic_mass_constant,
me, electron_rest_mass,
gee, gees, acceleration_due_to_gravity,
u0, magnetic_constant, vacuum_permeability,
e0, electric_constant, vacuum_permittivity,
Expand Down Expand Up @@ -213,6 +214,7 @@
'josephson_constant',
'von_klitzing_constant',
'Da', 'dalton', 'amu', 'amus', 'atomic_mass_unit', 'atomic_mass_constant',
'me', 'electron_rest_mass',
'gee', 'gees', 'acceleration_due_to_gravity',
'u0', 'magnetic_constant', 'vacuum_permeability',
'e0', 'electric_constant', 'vacuum_permittivity',
Expand Down
3 changes: 3 additions & 0 deletions sympy/physics/units/definitions/unit_definitions.py
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Expand Up @@ -122,6 +122,9 @@
t = metric_ton = tonne = Quantity("tonne", abbrev="t")
tonne.set_global_relative_scale_factor(mega, gram)

# Electron rest mass
me = electron_rest_mass = Quantity("electron_rest_mass", abbrev="me")


# Common length units

Expand Down
8 changes: 6 additions & 2 deletions sympy/physics/units/systems/si.py
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Expand Up @@ -25,7 +25,7 @@
coulomb, volt, ohm, siemens, farad, henry, tesla, weber, dioptre, lux,
katal, gray, becquerel, inch, liter, julian_year, gravitational_constant,
speed_of_light, elementary_charge, planck, hbar, electronvolt,
avogadro_number, avogadro_constant, boltzmann_constant,
avogadro_number, avogadro_constant, boltzmann_constant, electron_rest_mass,
stefan_boltzmann_constant, Da, atomic_mass_constant, molar_gas_constant,
faraday_constant, josephson_constant, von_klitzing_constant,
acceleration_due_to_gravity, magnetic_constant, vacuum_permittivity,
Expand Down Expand Up @@ -229,6 +229,10 @@
SI.set_quantity_dimension(vacuum_impedance, impedance)
SI.set_quantity_scale_factor(vacuum_impedance, u0 * c)

# Electron rest mass
SI.set_quantity_dimension(electron_rest_mass, mass)
SI.set_quantity_scale_factor(electron_rest_mass, 9.1093837015e-31*kilogram)

# Coulomb's constant:
SI.set_quantity_dimension(coulomb_constant, force * length ** 2 / charge ** 2)
SI.set_quantity_scale_factor(coulomb_constant, 1/(4*pi*vacuum_permittivity))
Expand Down Expand Up @@ -364,7 +368,7 @@
'planck_angular_frequency', 'ohm', 'pound', 'planck_pressure', 'G', 'psi',
'dHg0', 'von_klitzing_constant', 'planck_length', 'avogadro_number',
'mole', 'acceleration', 'information', 'planck_energy_density',
'mebibyte', 's', 'acceleration_due_to_gravity',
'mebibyte', 's', 'acceleration_due_to_gravity', 'electron_rest_mass',
'planck_temperature', 'units', 'mass', 'dimsys_MKSA', 'kelvin', 'kPa',
'boltzmann', 'milli_mass_unit', 'planck_impedance', 'electric_constant',
'derived_dims', 'kg', 'coulomb', 'siemens', 'byte', 'magnetic_flux',
Expand Down
15 changes: 9 additions & 6 deletions sympy/physics/units/tests/test_quantities.py
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Expand Up @@ -18,7 +18,7 @@
day, foot, grams, hour, inch, kg, km, m, meter, millimeter,
minute, quart, s, second, speed_of_light, bit,
byte, kibibyte, mebibyte, gibibyte, tebibyte, pebibyte, exbibyte,
kilogram, gravitational_constant)
kilogram, gravitational_constant, electron_rest_mass)

from sympy.physics.units.definitions.dimension_definitions import (
Dimension, charge, length, time, temperature, pressure,
Expand Down Expand Up @@ -278,6 +278,9 @@ def test_issue_quart():
assert convert_to(4 * quart / inch ** 3, meter) == 231
assert convert_to(4 * quart / inch ** 3, millimeter) == 231

def test_electron_rest_mass():
assert convert_to(electron_rest_mass, kilogram) == 9.1093837015e-31*kilogram
assert convert_to(electron_rest_mass, grams) == 9.1093837015e-28*grams

def test_issue_5565():
assert (m < s).is_Relational
Expand All @@ -304,11 +307,11 @@ def test_find_unit():
'deciliter', 'centiliter', 'deciliters', 'milliliter',
'centiliters', 'milliliters', 'planck_volume']
assert find_unit('voltage') == ['V', 'v', 'volt', 'volts', 'planck_voltage']
assert find_unit(grams) == ['g', 't', 'Da', 'kg', 'mg', 'ug', 'amu', 'mmu', 'amus',
'gram', 'mmus', 'grams', 'pound', 'tonne', 'dalton',
'pounds', 'kilogram', 'kilograms', 'microgram', 'milligram',
'metric_ton', 'micrograms', 'milligrams', 'planck_mass',
'milli_mass_unit', 'atomic_mass_unit', 'atomic_mass_constant']
assert find_unit(grams) == ['g', 't', 'Da', 'kg', 'me', 'mg', 'ug', 'amu', 'mmu', 'amus',
'gram', 'mmus', 'grams', 'pound', 'tonne', 'dalton', 'pounds',
'kilogram', 'kilograms','microgram', 'milligram', 'metric_ton',
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'micrograms', 'milligrams', 'planck_mass', 'milli_mass_unit', 'atomic_mass_unit',
'electron_rest_mass', 'atomic_mass_constant']


def test_Quantity_derivative():
Expand Down