Standard physical quantity is used for measurement because they are the components of a given body that can be measured using physical measuring tools and are less prone to errors; weighing balance, Rule are some of the measuring tools
Physical and non-physical quantities can be measured but the measurement carried out on physical quantities are less prone to error, when compared to non-physical measurement. Non-physical measurements are carried out using the Ordinal scale ( more or less an estimate measurement )
Examples of physical quantities includes : mass , height , temperature while Non-physical quantities includes : anger , personal feelings e.t.c
Hence the reason why standard physical quantities are used is because they are measured using measuring tools and are less prone to error
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