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It is used, along with significant digits, to indicate the precision of a measurement. Thus, in the two-significant-digit measurement 5.4 0.2 meters, the uncertainty interval is 0.2 meters. This means that the true value of the measurement is believed to lie between 5.2 meters and 5.6 meters.
BASIC RULES FOR UNCERTAINTY CALCULATIONS. 1) An Absolute Uncertainty is denoted by the symbol âââ and has the same units as the. quantity. Types of uncertainties: 2) A Relative or Percent Uncertainty is denoted by the symbol âÎµâ and has no units. To convert back and forth between the two types of uncertainties consider the following: m = (3.3 Â± 0.2) kg = (3.3 kg Â± 6.1%) The Absolute Uncertainty is: âm = 0.2 kg = (6.1/100) x 3.3 kg.