Measurement.define(:'dm³') do |unit|
  unit.alias :dm3, :'dm^3', :'dm*dm*dm', :'cubic decimeter', :'cubic decimeters'
  unit.convert_to(:m3) { |value| value / 1_000.0 }
  unit.convert_to(:cm3) { |value| value * 1_000.0 }