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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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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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