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**The Metric System The scientific system of measurement**

The International System of Units (SI) Based on the number 10 and multiples of 10

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**Length Distance between two points**

Meter (m) = basic unit of length = 39.4 inches Metric rulers and meter sticks used to measure

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**Meter stick -- 1 meter or 100 cm or 1000 mm long**

Metric ruler cm or 300 mm long

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**Volume The amount of space an object takes up**

Liter = the basic unit of volume (L) Cubic Centimeter (cc or cm3) – used to measure the volume of solids

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1 ml = 1 cc = 1 cm3 1000 ml = 1 L

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**Liquid: Measured with graduated cylinder**

Meniscus -- the curved surface of a liquid in a graduated cylinder. Read the bottom of the meniscus.

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Irregular solid: Measure out some water in the cylinder. This is volume 1. Drop the solid into the liquid causing the water level to go up. This is volume 2. Subtract volume 1 from volume 2 to get the volume of the solid.

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Solid: volume = length x width x height

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**Mass The measure of the amount of matter in an object**

Kilogram (kg) = basic unit of mass Measured with balance

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**Density The mass per unit volume of a substance Density = Mass Volume**

Density of water = 1 g/mL

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**Objects with density less than 1 g/mL float on water.**

Objects with density more than 1 g/mL sink in water.

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**Temperature Celsius scale is usual measurement but SI unit is Kelvin**

The Kelvin temperature can be found by adding 273 to the Celsius reading

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Water freezes at 0oC Water boils at 100oC Body temperature = 37oC Room Temperature = 21oC Temperature is measured with a thermometer

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Time The interval between two events Measured in seconds

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