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# Chapter 2, 3

### Revise Measurement, Denstiy and Flotation

Question | Answer |
---|---|

What are SI units? | SI units are the International System of Units, a set of measurement that can be used anywhere in the world. |

Why is it important to have a standard system of measurement? | So items can be made to the same specifications anywhere in the world. |

What are the SI units for Length, Mass, Time, Temperature, Area and Volume? | Meter, Gram Second, Degrees Celsius, Meter Squared, Meter Cubed. |

What piece of equipment would you use to measure mass? | A Mass balance. |

What piece of equipment would you use to measure time? | A stopwatch. |

What piece of equipment would you use to measure temperature? | A thermometer. |

How do you measure the area of a regular object? What formula would you use for a rectangle, a triangle and a circle? | Width multiplied by height. Triangle: Half the base by the height. Circle: Pi x Radius squared. |

How do you measure the area of an irregular object for example you hand? | Place it on a square grid, count the covered squares and add up the area. |

Define volume. | Volume is the amount of space an object takes up. |

What is density? | Density is the mass per unit volume of a object. |

What is the formula for density? | Mass divided by volume. |

What unit is density measure in? | Grams/Centimeter Cubed (g/cm3) |