CH 101 Lecture Notes - Lecture 2: Trailing Zero, Significant Figures, Decimal Mark
23 Nov 2016
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Document Summary
Quantitative numerical value, measurement is required: unit a standard, agreed upon by which to specify a measurement. English system (usa: quantitative measurements must use units. Si units: length (i) si unit: meter (m, mass si unit: kilogram (kg, time (t) si unit: seconds (s, temperature (t), or average of kinetic energy. Key temperatures: freezing point of water: 0 c or 32 f, room temperature: 25 c, boiling point of water: 100 c. Derived si units: volume = width x length x height = (m^3, velocity = distance/time = (m/s) Reliability of measurements: the uncertainty digit. Always add one more digit while measuring: reliability of measurement always depends on the instrument. The more digits, the more certainty of the measurement: assume an uncertainty of +- 1. Precision: accuracy how close your measurement is to the actual value, precision how closely repeated measurements are to one another (reproducibility) Reproducible results (precision) that is close to the actual value (accuracy)
