CHM 143 Lecture Notes - Lecture 3: Conversion Of Units, Scientific Notation, Reproducibility
15 Sep 2016
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The way you take the measurement tells info about uncertainty. Know with certainty that temp is between 103 and 104 . Temp between; where exactly is decided by researcher/technician. *the last digit that is reported is uncertain. The first three digits are certain; the last digit is estimated. Estimate one digit past incremental mark (generally; not always) 1ml incremental marks than you would estimate to the 0. 1ml. 0. 1ml incremental marks than you would estimate to the 0. 01ml. 0. 5ml incremental marks than you wouldn"t estimate an additional digit. All digits that are known with certainty plus the last digit that is estimated. 28. 505 = 5 sig figs (28. 50 certain . 005 uncertain) Significant figure rules: any nonzero digit that is reported is significant, zero = depends, leading zeros- on the left. 0. 00315 3 sig figs: confined zeros- zero between two non zero digits. 206. 4 4 sig figs: trailing zeros- on the right of #.
