Metric system
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Metric System. Measurements. Length-measure of distance Measured with a yard stick or ruler Volume-measure of how much space an object takes up Measured with a graduated cylinder, by water displacement, or by equation cube volume=length X width X height (LXWXH)

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Metric System

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Metric system

Metric System


Measurements

Measurements

  • Length-measure of distance

    • Measured with a yard stick or ruler

  • Volume-measure of how much space an object takes up

    • Measured with a graduated cylinder, by water displacement, or by equation

      • cube volume=length X width X height (LXWXH)

  • Mass-technically a measure of matter, but here on Earth it is the same thing as weight

    • Measured with a triple-beam-balance


Metric system1

Metric System

  • The metric system is based on a base unit for each measurement

    • Length = meter

    • Volume = liter

    • Mass(Weight) = gram

    • Temperature = Celsius

    • Time = seconds

  • Prefixes plus base units make up the metric system

    • Example:

      • Centi + meter = Centimeter


  • Metric system2

    Metric System

    • The three prefixes that we will use the most are:

      • kilo

      • centi

      • milli


    Metric system3

    Metric System

    • These prefixes are based on powers of 10.

    • From each “step” is either:

      • 10 times larger

        or

      • 10 times smaller


    Why 10 times larger

    Why 10 times larger?

    • Units that are 10 times larger or smaller are easier to convert.

      1 centimeter = 10 millimeters

    40

    41

    40

    41

    1 cm


    Metric system4

    Metric System

    • For each “step” to right, you are multiplying by 10

      1 liter = 10 deciliters = 100 centiliters

      2 grams = 20 decigrams = 200 centigrams

    ( 1 x 10 = 10) = (10 x 10 = 100)

    (2 x 10 = 20) = (20 x 10 = 200)


    Metric system5

    Metric System

    • An easy way to move within the metric system is by moving the decimal point one place for each “step”

      1 meter = 10 decimeters = 100 centimeters

      or

      1.00 meter = 10.0 decimeters = 100. centimeters


    Metric system6

    Metric System

    • Now let’s try from meters to kilometers:

      16000 meters =

      1600 decameters

      160 hectometers

      16 kilometers


    Metric system7

    Metric System

    • If you move to the left in the diagram, move the decimal to the left

    • If you move to the right in the diagram, move the decimal to the right


    Temperature

    Temperature

    • Celsius Scale is based on water

      • The freezing point of water is 0OC

      • The boiling point of water is 100OC


    Temperature conversion

    Temperature Conversion

    • The equations to convert between Fahrenheit and Celsius are:

      °F = (1.8 x °C) +32

      °C = (°F-32) x 0.555


    Example

    Example

    • If it is 80°F outside, what is the temperature in °C?

      °C = (°F-32) x 0.555

      °C = (80-32) x 0.555

      °C = (48) x 0.555

      °C = 26.6


    Density

    Density

    • Density is calculated by dividing the mass of an object by the volume.

      Density = Mass/Volume

    • For example 1mL of water has a mass of 1g.

      Density = Mass/Volume

      Density = 1g/1mL

      Density = 1g/mL

    • Objects with a density less than 1g/mL will float in water and objects with a density greater than 1g/mL will sink in water


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