ISO 80000-12:2019 is an International Organization for Standardization (ISO) standard that specifies the quantities and units for condensed matter and materials science. Specifically, it defines terms, quantities, units, and symbols related to condensed matter physics, including solid-state physics, materials science, and related fields. The "Amd1" likely refers to an amendment or correction to the original standard, indicating that it's a revised version.
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