Made to measure: why we can’t stop quantifying our lives

From ancient Egyptian cubits to fitness tracker apps, humankind has long been seeking ever more ways to measure the world – and ourselves. But what is this doing to us?

If anything exemplifies the power of measurement in contemporary life, it is Standard Reference Peanut Butter. It’s the creation of the US National Institute of Standards and Technology (NIST) and sold to industry at a price of $1,069 for three 170g jars. The exorbitant cost is not due to rare ingredients or a complex production process. Instead, it is because of the rigour with which the contents of each jar have been analysed. This peanut butter has been frozen, heated, evaporated and saponified, all so it might be quantified and measured across multiple dimensions. When buyers purchase a jar, they can be certain not only of the exact proportion of carbohydrates, proteins, sugars and fibre in every spoonful, but of the prevalence – down to the milligram – of dozens of different organic molecules and trace elements, from copper and magnesium to docosanoic and tetradecanoic acid. Hardly an atom in these jars has avoided scrutiny and, as a result, they contain the most categorically known peanut butter in existence. It’s also smooth, not crunchy.

The peanut butter belongs to a library of more than 1,300 standard reference materials, or SRMs, created by NIST to meet the demands of industry and government. It is a bible of contemporary metrology – the science of measurement – and a testament to the importance of unseen measures in our lives. Whenever something needs to be verified, certified or calibrated – from the emission levels of a new diesel engine to the optical properties of glass destined for high-powered lasers – the SRM catalogue offers the standards against which checks can be made. Most items are mundane: concrete and iron for the construction trade; slurried spinach and powdered cocoa for food manufacturers. But others seem like ingredients lifted from God’s pantry: ingots of purified elements and pressurised canisters of gases, available in finely graded blends and mixtures. Some are just whimsical, as if they were the creation of an overly zealous bureaucracy determined to standardise even the most peculiar substances. Think: domestic sludge, whale blubber and powdered radioactive human lung, available as SRMs 2781, 1945 and 4351.

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