Quantities and Measures

In geography as in Earth science, data are quantified, and numbers need to be manipulated constantly. This chapter deals with a base 10 system and a sexagesimal numeral system (for the use of time and angles). It deals with the concepts of measurement, unit, and approximate value (rounded, significant digits, uncertainties), as well as unit conversions, percentages, and rates. It also discusses scientific notation and the powers of ten. These notions are fundamental in applied science. The exercises show various contexts, for example, flow, planets, temperature, and albedo.