- 1 Measurements and Units
- 1.2 Standard Form

Base Quantity | Name | Symbol |
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Length | Metre | m |

Mass | Kilogram | kg |

Time | Second | s |

Electric Current | Ampere | A |

Thermodynamic Temperature | Kelvin | K |

Amount of Substance | Mole | mol |

Luminous Intensity | Candela | cd |

All derived units can be defined in terms of SI base units. The kilogram is the only base unit not based on a universal constant.

Experimental error can be random or systematic.

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Random errors can be environmental or in reading errors

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Systematic errors lead to consistently incorrect results

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Instrumental error

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Poor experimental design

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A measurement is repeatable if the experiment gives consistent results

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A measurement is reproducible if it is repeatable using different techniques in different labs

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A measurement is accurate if it is close to the true value

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A measurement is precise if it gives a small range of answers

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The resolution of a measurement device is the smallest increment it can measure

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When adding or subtracting quantities, you should add their absolute uncertainties

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When multiplying quantities, you should add their percentage uncertainties

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Independent variable (cause) on x-axis

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Dependent variable (effect) on y-axis

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Uncertainty is \(\pm\) the greatest difference between the best fit and two worst fit lines