CHEM 120 Chapter Notes - Chapter 2: Observational Error, Unit, Thermal Energy
Document Summary
*quanti cation: the assignment of a number to a thing requires units. More digits = greater certainty / less digits = weaker certainty. We assume slight uncertainty of the last digit with a +/- 1. *scienti c measurements are reported as every digit is certain expect for the last which is estimated* Accuracy: how closet measured value is to the actual value. Precision: how close the series of measurements are to one another or how reproducible the series of measurements are. Inconsistency in a series of measurements can be from random error: Error that has an equal probability of being to high or to low. Random error will average itself out with enough trials. Systematic error is an error that tends to be either to low or to high. Systematic error will not average itself out with repeated trials. Density if the ratio of mass to volume (d= mass / volume)
