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# Measurement&unit

### science junior cert

SI unit of length metre (m)
SI unit of mass kilogram (kg)
SI unit of time second(s)
SI unit of area metre squared
SI unit of volume metre cubed
Used to measure straight lines Ruler/metre stick
Used to measure short curved lines Opisometre
Used to measure long curved lines Trundle wheel
Used to measure diameters or widths of objects Vernier callipers
How to calculate the area of a square or rectangle Length X Breadth
How to calculate the area of an irregular shaped object Trace outline on graph paper and count squares
How to calculate volume of a regular shaped object Length X Breadth X Height
How to calculate volume of a irregular shaped object Use a graduated cylinder with water or an overflow can and measure the amount of water displaced.
How to calculate volume liquids Pour into graduated cylinder and read volume
Created by: gcu science

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