## SI System of UnitsThe Si system of units are explained. This is the system that will be used everywhere in the resources of Proofs program |

## Gaussian UnitsWe briefly present Gaussian units and trace the source of appearance of velocity of light in Maxwell's equations. Some Important Constants |

## Using dimensional Analysis to get Quick Numerical EstimatesBy means of a few examples we show how dimensional analysis can be used to quickly estimate numerical values of expressions occurring in problems |

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