{"id":"F2009B00180","name":"National Measurement Act 1960 - Determination by the National Standards Commission - Recognized-Value Standard of Measurement of Density - Standard Mean Ocean Water","slug":"f2009b00180","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":326816,"registerId":"commonwealth-F2009B00180-current","compilationNumber":null,"startDate":"2026-04-08","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"National Measurement Act 1960 - Determination by the National Standards Commission - Recognized-Value Standard of Measurement of Density - Standard Mean Ocean Water","content":"national measurement act 1960\n\ndetermination by the national standards commission\n\nRecognized-Value Standard of Measurement of Density\n\nStandard Mean Ocean Water\n\nIn pursuance of paragraph 8A(1)(a) of the National Measurement Act 1960, the National Standards Commission hereby determines that the magnitude of the density of standard mean ocean water at a temperature of 3.99°C and at a mean pressure of 101 325 Pa shall be a recognised-value standard of measurement having the exact value 999.975 kg.m\\-3.\n\nFor the purposes of this Determination standard mean ocean water is pure water, free of dissolved gas, in which the ratio of the number of oxygen atoms of mass number 18 to the number of oxygen atoms of mass number 16 is 0.002 005 and the ratio of the number of deuterium atoms to the number of hydrogen atoms is 0.000 155 76.\n\nDated this 21st day of March 1985\n\nThe common seal of the national T.J. PETRY\n\nstandards commission was hereto\n\naffixed by authority of the Commission\n\nin the presence of","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1314},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This determination remains strictly limited to its original purpose of establishing a single recognized-value standard for density measurement of Standard Mean Ocean Water under specified conditions."},"complexity_factors":["Single operative provision with one fixed value","Only one defined term (Standard Mean Ocean Water)","No conditional logic, exceptions, or nested provisions","Minimal cross-referencing (only the enabling provision)","Extremely short length (one page)"],"plain_english_summary":"This legal instrument sets an exact scientific standard for measuring the density of a specific type of water called **Standard Mean Ocean Water**.\n\n**What it does:**\n- Fixes the density of Standard Mean Ocean Water at exactly **999.975 kilograms per cubic metre** when measured at 3.99°C and standard atmospheric pressure (101,325 Pascals).\n- This value becomes an official 'recognised-value standard of measurement' under the National Measurement Act.\n\n**Why it matters:**\n- Provides a precise reference point for calibrating scientific instruments (like density meters and hydrometers) to ensure accurate and consistent measurements across laboratories and industries.\n- Standard Mean Ocean Water is specially defined as pure water with no dissolved gases and specific isotopic composition (particular ratios of oxygen-18 to oxygen-16, and deuterium to hydrogen).\n\n**Who it affects:**\n- Scientific researchers, calibration laboratories, and industries requiring high-precision density measurements."}},"importantCases":[],"_links":{"self":"/api/acts/f2009b00180","history":"/api/acts/f2009b00180/history","analysis":"/api/acts/f2009b00180/analysis","conflicts":"/api/acts/f2009b00180/conflicts","importantCases":"/api/acts/f2009b00180/important-cases","documents":"/api/acts/f2009b00180/documents"}}