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The calculations and formulae associated with physics, biology, and chemistry, such as converting units of measurement.

The links to these instructional YouTube clips come from The Organic Chemistry Tutor.

Significant Figures Rules [length: 1h:36m:01s]
This video details how to round decimals to the appropriate number of sig figs and how to determine which digit is certain and uncertain.
This chemistry and physics video tutorial explains how to convert from celsius to fahrenheit to kelvin using two formulas / equations.