THE METRIC SYSTEM

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THE METRIC SYSTEM
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Le Système International dUnitès

• Used to evaluate and merit the validity of
  research, scientists communicate using the same
  system of measurementthe SI system
• The Metric System is based on the fundamental
  units of measure for length, volume, and mass.

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L E N G T H

• SI standard meter (m)
• - Distance from doorknob to the floor
• 100 cm 1 m
• 10 mm 1 cm
• 1000 mm 1 m
• 1000 m 1 km
• 100,000 cm 1 km

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W E I G H T

• SI standard Newton (N)
• - 1 N medium sized orange
• Weight is the measure of gravitational force on
  an object

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M A S S

• Mass is the amount of matter in an object
• - depends on the number and kinds of atoms
• that make up the object
• SI standard kilogram (Kg)

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• The base units of volume and weight are linked.
• The gram was originally defined as the mass of 1
  mL of water at 4 degrees Celsius.
• 1g 1mL H2O at 4 ºC

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Area Volume

• Area is the amount of surface within the
  boundaries expressed in square units of length
• - SI standard m² or cm²

• Volume is the amount of space occupied by an
  object
• - SI standard m³ (solid)
• - SI standard mL or L

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• The base units of length and volume are linked in
  the metric system.
• By definition, a liter is equal to the volume of
  a cube exactly 10 cm tall, 10 cm long, and 10 cm
  wide. Because the volume of this cube is 1000
  cubic centimeters and a liter contains 1000
  milliliters, 1 milliliter is equivalent to 1
  cubic centimeter.
• 1 mL 1cm3 (1cc)

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D E N S I T Y

• D M/V
• - SI standard g/cm³ , g/mL, or kg/m³

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Time

• Interval between two events
• SI standard second

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Temperature

• Measure of the average vibrations of the
  particles in a material
• SI standard Kelvin (K)
• - Absolute zero (0 K) - 273 ºC
• Convert Celsius to Fahrenheit (multiply by 9.5
  32 º) 5/9

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• Can you name all the SI units?

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• Meter
• Newton
• Kg
• m² or cm³
• m³ or mL or L
• g/cm³
• Sec
• Kelvin

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Scientific Notation

• Expresses very small and large numbers as a power
  of 10
• Ex) 458,600,000 4.586 x 10?
• Ex) 0.000000319 3.19 x 10?

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1.3 Communicating in Science
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Lab Reports

• Record analyze all information collected an
  experiment
• Aid in drawing conclusions from recorded data
• MUST BE ORGANIZED AND DESCRIPTIVE

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Graphs

• Line graphs comparison of 2 variables
• - x axis Independent variable
• - y axis Dependent variable

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Models

• NO, NO, NOnot THAT model!!

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• Idea, a system, or a mathematical expression that
  is similar to the idea being explained.
• Changeable

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Theories Laws

• Theories are only valid if it is consistent with
  observations, makes predictions that can be
  tested, and is the simplest explanation of
  observations
• Changes with new data

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• Laws are Rules of Nature
• Events described by laws are observed to be the
  same EVERY TIME
• Ex) Sir Isaac Newtons 1st Law of motion
• - an object at rest or in motion stays at rest
  or in motion unless it is acted upon by an
  outside force

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• THEORIES ARE OFTEN USED TO EXPLAIN SCIENTIFIC
  LAWS
• Work quietly with partner and complete the
  Problem-Solving Lab on page 18 (1-5)