Article ID: CBB653807426

Heaps of moles? – Mediating macroscopic and microscopic measurement of chemical substances (2020)

unapi

In this paper I take a close look at the SI base quantity “amount of substance”, and its unit, the mole. The mole was introduced as a base unit in the SI in 1971, and there is currently a proposal to change its definition. The current definition of the mole shows a certain ambiguity regarding the nature of the quantity “amount of substance”. The proposed new definition removes the ambiguity, but at a cost: it becomes difficult to justify treating amount of substance as having its own dimension, and hence its own unit, the mole. I argue that the difficulties with amount of substance result from its role as a mediator between macroscopic and microscopic scales. To understand why amount of substance might have its own dimension, we need to connect amount of substance to mass, contra current proposals to separate them.

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Authors & Contributors
Miguel Ohnesorge
Usenov, Galymzhan
Adwait A. Parker
Epstein, Jessica
Suleimenov, Pirimbek
DiCaglio, Joshua
Concepts
Measurement
Standards and standardization
Exactness; precision; accuracy
Scales (weights and measures)
Metric system
Mass
Time Periods
19th century
20th century, late
21st century
20th century, early
18th century
20th century
Places
London (England)
Polar regions
Bulgaria
Australia
Kazakhstan
Ireland
Institutions
Convention du mètre (1875)
Académie Royale des Sciences (France)
Royal Society of London
British Association for the Advancement of Science
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