Measurement.define(:cl) do |unit|
  unit.alias :centiliter, :centiliters
  unit.convert_to(:kl) { |value| value / 10_0000.0 }
  unit.convert_to(:hl) { |value| value / 10_000.0 }
  unit.convert_to(:dal) { |value| value / 1_000.0 }