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What is Science?. Science is a Process. A method of inquiry A systematic process that employs a method Investigation of the world around us A process with two goals: to improve the quality of life to explain natural phenomena. A Model of Scientific Inquiry.

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Presentation Transcript
science is a process
Science is a Process
  • A method of inquiry
  • A systematic process that employs a method
  • Investigation of the world around us
  • A process with two goals:

to improve the quality of life

to explain natural phenomena

a model of scientific inquiry
A Model of Scientific Inquiry
  • Observation (leads to assumptions)
  • Develop an hypothesis

(a testable prediction)

  • Experiment
  • Interpretation
  • Either supports or refutes the hypothesis
a successful experiment
A Successful Experiment
  • Test one prediction of a hypothesis at a time
  • Control group: a standard for comparison, all factors the same as the experimental group EXCEPT one
  • Variable is the object or event that may differ
  • Section 1.6 page 14, example
no proof
No Proof!
  • The word prove is not used.
  • An experiment can reject an hypothesis, but it does not prove that that is the only explanation.
theory
Theory
  • A scientific theory is a hypothesis that has never been disproved after rigorous testing
  • Widely accepted
  • It does not have the same meaning as “theory” used in casual conversation
a sample experiment
A Sample Experiment
  • Observation: two different forms of caterpillars of Nemoria arizonaria moth
  • Catkin form in spring
  • Twig form later in summer
  • What hypothesis could you test to explain this?

Catkin form

Twig form

a sample experiment1
A Sample Experiment
  • From observation, a hypothesis was formed
  • If eggs from a single female are exposed to spring temperatures (15°), then they will develop into catkin form. At summer temperatures (25°), they will be twig form
results
Results
  • Eggs at both 15 and 25 degrees developed into the catkin form.
  • So experimenters tried again.
  • If eggs from a single female feed on catkins, then they will be catkin form, and if they feed on leaves, they will be twig form.