ppm
Parts per million. Used for mass accuracy: ppm = (observed − theoretical)/theoretical × 10⁶.
Related terms
- Mass accuracy
- Difference between measured and theoretical mass, in ppm of the theoretical value. A relative measure — the same ppm is a different absolute error at different masses.
see also ppm · Rule AX-R01
Where this term appears
The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.
- Assay report records — the term appears in result tables, peak tables and provenance blocks
- Method references — where the measurement behind the term is defined
- All 22 glossary terms beginning with P