Jenkins v WMC Resources Ltd

The case of Jenkins v WMC Resources Ltd was heard by the High Court of Australia. The dispute centred on the interpretation of the National Measurement Act 1960 (Cth), specifically the definitions of "Australian legal unit of measurement" in sections 10 and 3. The plaintiff, Jenkins, brought the case against WMC Resources Ltd, arguing that the company's measurement of sulphur dioxide concentration was not in compliance with the Act. The central issue was whether the measurement unit used by the defendant, micrograms per cubic metre of dry air at zero degrees Celsius and 1 atmosphere pressure, constituted an "Australian legal unit of measurement" for the concentration of sulphur dioxide.

The court was tasked with determining the precise meaning of the term "Australian legal unit of measurement" as it applied to the measurement of physical quantities. The High Court held that a combination of units could only be deemed an "Australian legal unit of measurement" if that particular combination was prescribed in relation to the specific physical quantity being measured. In this instance, the court concluded that the measurement unit used by WMC Resources Ltd did not meet the criteria set out in the Act. The combination of units used did not correspond to a prescribed "Australian legal unit of measurement" for the concentration of sulphur dioxide.

As a result of the court's reasoning, the appeal was allowed. The decision underscored the importance of adhering to prescribed units of measurement as outlined in the National Measurement Act 1960 (Cth). This ruling serves as a reminder for companies to ensure their measurement practices comply with legislative requirements to avoid similar legal challenges in the future.