Multiple systems of quantities developed across the world over time. Unified systems can facilitate research and communication within the scientific community, doing away with the need for conversion factors.
ISO 80000 comprises a series of international standards introducing the International System of Quantities (ISQ). The guidelines of the ISO 80000 family of standards specify the use of physical quantities and units of measurement, along with the related formulas and units, in scientific and educational documents.
ISO 80000-9 guides you with names, symbols, definitions, and units for quantities of physical chemistry and molecular physics. Where appropriate, conversion factors are also provided.
ISO 80000-9 on quantities and units for physical chemistry and molecular physics has applications for education and research in the fields of:
In ISO 80000-9, symbols for substances are shown as subscripts, for example cB, wB, pB for substance B. Generally, it is advisable to put symbols for substances and their states in parentheses on the same line as the main symbol, for example c(H2SO4).
Additional qualifying information on a quantity symbol may be added as a subscript or superscript or in parentheses after the symbol.
The guidelines of ISO 80000-9 provide you with names, symbols, definitions and units of physical chemistry and molecular physics for research and educational use.
BS EN ISO 80000-9:2019 supersedes ISO 80000‑9:2009 BS EN ISO 80000-9:2019 includes some technical and editorial changes with respect to ISO 80000‑9:2009. These include:
ISO 80000-9
EN ISO 80000-9