While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the measurement result that is more implicitly represented and will be discussed later. Every measurement provides three kinds of information: the size or magnitude of the measurement (a number) a standard of comparison for the measurement (a unit) and an indication of the uncertainty of the measurement. Measurements provide the macroscopic information that is the basis of most of the hypotheses, theories, and laws that describe the behavior of matter and energy in both the macroscopic and microscopic domains of chemistry. Perform basic unit calculations and conversions in the metric and other unit systems. ![]() ![]() Describe the properties and base units of length, mass, volume, density, temperature, and time. ![]()
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