A number of errors may be committed when a measurement is made: error due to the measuring instrument, error due to accessories of the measuring instrument, reading error, etc. These are called partial errors. Measurement uncertainty must enable all partial errors to be taken into account by combining them in accordance with a law under which twice the square root of the sum of the squares of the partial errors is applied to the measurement result.
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Why is temperature not a physical quantity like other measurement units?
Temperature is not a quantity in the strict sense of the term as the majority of other measurement units are. A quantity is something which can be increased or decreased, for example length, area, power output, etc. Measuring a quantity…