Chapter 1 Chemical Arithmetic
Chemistry is basically an experimental science. In it, we study the physical and chemical properties of substances and measure them up to possibility. The results of measurement can be reported in two steps, (a) Arithmetic number, and (b) Unit of measurement. Every experimental measurement varies slightly from one another and involves some error or uncertainty depending upon the skill of the person making the measurements and measuring instrument. The closeness of the set of values obtained from identical measurements is called precision and a related term refers to the closeness of a single measurement to its true value called accuracy. Significant figure.
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