Scientific Constants & Formulas Tutorial¶
CDS bundles a curated set of physical constants and classical physics formulas, all pure Python.
1. Lookup a Constant¶
from cds.scientific import get_constant, CONSTANTS
print(get_constant("c")) # speed of light, m/s
print(sorted(CONSTANTS)) # all available names
2. Mechanics¶
from cds.scientific import kinetic_energy, gravitational_force, escape_velocity
print(kinetic_energy(mass=10.0, velocity=5.0)) # Joules
print(gravitational_force(m1=5.0, m2=10.0, r=2.0)) # Newtons
print(escape_velocity(mass=5.972e24, radius=6.371e6)) # Earth, m/s
3. Waves, Photons & Relativity¶
from cds.scientific import (
photon_energy,
wave_frequency,
de_broglie_wavelength,
schwarzschild_radius,
)
print(photon_energy(frequency=5.0e14)) # green photon, J
print(wave_frequency(wavelength=500e-9)) # Hz
print(de_broglie_wavelength(mass=9.109e-31, velocity=1e6)) # electron, m
print(schwarzschild_radius(mass=1.989e30)) # Sun, m