CODEWITHSUNDEEP
sympy
nammerkage
nammerkage

Reputation: 304

Sympy unit see value of constant?

If I use the units module in Sympy, I can't find how to see the values of units. Say I wanted to see what is the gravitional constant.

import sympy.physics.units as u
G = u.gravitational_constant

What should I do to get some value out? I know it's possible to call Sympy's module "convert to" But it assumes I already know what the constant is. For example to see the speed of light I can write:

u.convert_to(u.speed_of_light,u.meter/u.second)
>>> 299792458 m/s

But that assumes I know speed of light is a velocity.

Upvotes: 1

Views: 236

Answers (1)

smichr
smichr

Reputation: 19115

Every Quantity has a dimension:

>>> from sympy.physics.units import *
>>> G.dimension
Dimension(length**3/(mass*time**2))

Knowing these, you can see the value for your dimensions of interest:

>>> G.convert_to(m**3/kg/s**2)
6.6743e-11*meter**3/(kilogram*second**2)

Upvotes: 2

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