05ppm
05ppm is not a standard standalone term, but in many data sets and specifications it appears as a numeric annotation referring to a concentration expressed in parts per million (ppm). Without additional context, 05ppm is commonly read as 0.05 ppm, though in some fixed-width formats the leading zero may be a placeholder and the intended value could be 5 ppm. The exact interpretation should be confirmed from the source documentation.
ppm stands for parts per million, a unit used to express very dilute concentrations. It can denote
Applications of ppm measurements include environmental monitoring, drinking-water safety, air quality, chemistry, pharmaceuticals, and process control,
Interpretation and units are context-dependent. ppm is dimensionless only when the basis (mass, volume, or mass