pint does not map bar/Pa to unitless.

[SullivanMuse]

Why does ureg.bar/ureg.Pa not give answer as 10**5?

Shouldn't this be unitless?

If not, please explain where I am going wrong.

[hgrecco]

It does if you use auto_reduce_dimensions=True, take a look at the docs.
or do it in an explicity way.

>>> (1.*ureg.bar/ureg.Pa).to_base_units()
<Quantity(100000.0, 'dimensionless')>