This video uses several examples to define what logarithms are.

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This video defines logarithms using several examples.
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Unit conversion

by Sal Khan

This video defines the prefixes used in the metric system and demonstrates how to convert units.
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This video explains how to convert units when solving problems about speed.
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This video reviews what logarithms are, introduces several properties for logarithms, and demonstrates how these properties can be used to solve problems.
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This video introduces the last two logarithm properties and demonstrates how they can be used to solve problems.
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This video introduces the idea of scientific notation and explains why it is important.
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This video gives several examples of how to write numbers using scientific notation.
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This video explains the concept of ratios by giving several example.
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This video solves a problem given to Sal by a nursing student asking: how many ML of solution need to be given to patient per dose? This problem involves a lot of unit conversion.
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