ISO 80000-5:2019/PRF Amd 1

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ISO 80000-5:2019 is an international standard that defines quantities and units for thermodynamics. The "Amd1" likely refers to an amendment to the standard, meaning it's a correction, clarification, or addition to the original text. The "PDF" indicates the document is formatted as a Portable Document Format, a standard for presenting documents electronically.