Mean air density expression
When declaring the mean air density expression in the theory.ipynb file, this error arises :
ValueError Traceback (most recent call last) in 106 unit = pascal 107 --> 108 class rho_a(Variable): 109 """Mean air density [kg/m^3]""" 110 unit = kilogram / meter**3
/opt/conda/lib/python3.8/site-packages/essm/variables/_core.py in new(cls, name, parents, dct) 73 ) 74 if dim_derived != dim_unit: ---> 75 raise ValueError( 76 'Invalid expression units {0} should be {1}'.format( 77 instance.unit, unit
ValueError: Invalid expression units kg/m3 should be kg/m3