CHE 1300 Chapter Notes - Chapter 2: Metric System, Decimal Mark, Scientific Notation
30 Aug 2015
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Method for making very large or very small numbers more compact and easier to write. Decimal point is moved to the left, the exponent of 10 is positive. Tells us what scale or standard is being used to represent the results of the measurement. 1960 international agreement set up a comprehensive system of units called the. Si unit of length is the meter (longer than a yard by a little) Volume is the amount of 3d space occupied by a substance. Graduated cylinder is used to measure volumes of liquids. Mass can be defined as the quantity of matter present in an object. Gram balance compares the mass of the object to a set of standard masses. Certain numbers in a measurement are the same regardless of who made the measurement. Uncertain numbers are the estimated number and can vary. A measurement always has some degree of uncertainty. Significant figures are determined by the inherent uncertainty of the measuring device.
