class_docstr: Physical quantity: can be a unit of measure, a constant or a generic quantity.
class_docstr_tok: ["Physical","quantity",":","can","be","a","unit","of","measure",",","a","constant","or","a","generic","quantity","."]
code: def dimension(self):
      from sympy.physics.units import UnitSystem
  
      unit_system = UnitSystem.get_default_unit_system()
      return unit_system.get_quantity_dimension(self)
  
imports: from sympy.core.expr import AtomicExpr
  from sympy.core.symbol import Symbol
  from sympy.core.sympify import sympify
  from sympy.physics.units.dimensions import _QuantityMapper
  from sympy.physics.units.prefixes import Prefix
label_desc: Use image node_id 5 for calling the Quantity obj's underlying member method code with example usage: obj.dimension() and returns: unit_system