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# What are absolute measurements and absolute errors?

An absolute measurement is based on first principle measurements. Most measurements are comparison. An absolute measurement doesn't rely on calibration of the instrument. For …example wavelength measurements can be made without calibration by looking at the number of beats per seconds (Hertz). .
Absolute error is the magnitude of the difference between the exaxt value of the value measured. It can be expressed as a number, e.g. the molecular weight measured is 27 000 grams per moles while the known molecular weight of the structure is 27 500, the absolute error is 500 grams per mole. (MORE)