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- """
- MKS unit system.
- MKS stands for "meter, kilogram, second".
- """
- from sympy.physics.units import UnitSystem
- from sympy.physics.units.definitions import gravitational_constant, hertz, joule, newton, pascal, watt, speed_of_light, gram, kilogram, meter, second
- from sympy.physics.units.definitions.dimension_definitions import (
- acceleration, action, energy, force, frequency, momentum,
- power, pressure, velocity, length, mass, time)
- from sympy.physics.units.prefixes import PREFIXES, prefix_unit
- from sympy.physics.units.systems.length_weight_time import dimsys_length_weight_time
- dims = (velocity, acceleration, momentum, force, energy, power, pressure,
- frequency, action)
- units = [meter, gram, second, joule, newton, watt, pascal, hertz]
- all_units = []
- # Prefixes of units like gram, joule, newton etc get added using `prefix_unit`
- # in the for loop, but the actual units have to be added manually.
- all_units.extend([gram, joule, newton, watt, pascal, hertz])
- for u in units:
- all_units.extend(prefix_unit(u, PREFIXES))
- all_units.extend([gravitational_constant, speed_of_light])
- # unit system
- MKS = UnitSystem(base_units=(meter, kilogram, second), units=all_units, name="MKS", dimension_system=dimsys_length_weight_time, derived_units={
- power: watt,
- time: second,
- pressure: pascal,
- length: meter,
- frequency: hertz,
- mass: kilogram,
- force: newton,
- energy: joule,
- velocity: meter/second,
- acceleration: meter/(second**2),
- })
- __all__ = [
- 'MKS', 'units', 'all_units', 'dims',
- ]
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