Physics
Units and Measurements
Significant Digits
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The digits in a number that are known with certainty plus one uncertain digit.
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Significant digits are the digits in a number that are known with certainty plus one uncertain digit. They are used to indicate the precision of a measurement.
Units
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Standard quantities used to express measurements.
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Units are standard quantities used to express measurements. They provide a common reference for comparing different quantities.
CGS
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Centimeter-Gram-Second system of units.
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The CGS (centimeter-gram-second) system is a system of units based on the centimeter, gram, and second as the base units of length, mass, and time, respectively.
SI
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The International System of Units.
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The International System of Units (SI) is the modern form of the metric system and is the most widely used system of measurement.