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The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
The Methods Of Science
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The Methods Of Science


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Scientific Method, si measurement

Scientific Method, si measurement

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  • 1. The Methods of Science
    • Science: method for studying the natural world
      • Life, Earth, Physical science
      • Explains the natural world
      • Scientists learn by investigation  observation, experimentation, or modeling
  • 2. Scientific Method
    • State a problem
    • Gather information
    • Form a hypothesis
      • A possible explanation
    • Test the hypothesis
  • 3. Testing a Hypothesis
    • Experiments with variables
      • Dependant variable changes values as other variables change
      • Independent variable is changed to determine how it will affect the dependent variable
      • A variable that does not change when other variables change is a constant
      • A control is the standard to which test results are compared
  • 4.
    • Analyze data from experiment or investigation
    • Form a conclusion based on the data
    • Reduce bias by
      • keeping accurate records
      • Repeating the experiment
      • Using data that is measurable
  • 5. Standards of Measurement
    • Standard
      • Exact quantity that people agree to use for comparison
    • Measurements must be taken carefully
      • Precise: how closely measurements are to each other
      • Accurate: how closely measurement is to real or accepted value
  • 6. International System of Units: SI
    • Based on the metric system  multiples of 10
    • Used by scientists worldwide
  • 7.
    • Distance
      • Measure distance between 2 points
      • SI unit of measure is the
        • Meter: about a baseball bat in length
    • Volume
      • Amount of space occupied by an object
      • 1 L= 1 dm 3 = 10 cm 3 = 1000 ml
  • 8.
    • Mass
      • A measurement of the quantity of matter in an object
    • Density is a combination of units  derived unit
        • Mass/volume
        • Aluminum vs. iron
  • 9.
    • Time
      • Interval between 2 events
      • SI unit  seconds
    • Temperature
      • Measure of how hot or cold something is
      • SI unit is Kelvin  K
      • 0 K is the coldest possible temperature
        • -273 ºC = 0 K
  • 10. Communicating with Graphs
    • Visual display of information or data
      • Used to detect patterns
    • Line graph
      • Shows a relationship where the dependent variable changes due to a change in the independent variable
      • x axis = independent variable
      • y axis = dependent variable
  • 11.
    • Bar graph compares information collected by counting
      • Each bar represents a quantity counted at a particular time
    • Circle graph shows how a whole is broken into parts
      • The parts represent percentages of the whole
  • 12.  
  • 13.