A qualitative observation describes something through non-numerical terms. SI unit for mass: Grams SI unit for length: Meters SI unit for volume: Meters cubed The assumed uncertainty of a number is plus or minus one in the last significant digit of the number. The amount of significant figures in a measurement relies on the precision of the measuring tool. This in turn determines the uncertainty of the measurement.
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A qualitative observation describes the qualities of something; for example, its texture. The SI units for mass are grams, while the SI units for length are meters. The SI units for volume are meters cubed. The assumed uncertainty in a number is plus or minus one in the last sig fig of the number (i.e. .001 grams -> the assumed uncertainty from .000 to .002). The precision of a measuring tool determines the amount of sig figs in the measurement, and therefore, the uncertainty of the measurement.