The Nature of Science & Scientific Method (Foundations of Inquiry)
Science is derived from the Latin word Scientia, meaning knowledge based on demonstrable and reproducible data. It is a continuous, dynamic pursuit of understanding the natural universe.
1. The Core Scientific Method
Scientists investigate questions through a systematic, reproducible multi-step procedure:
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1. Observation & Wondering
(Using senses & measurement instruments)
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2. Formulating a Specific Question
(Defining the exact problem to investigate)
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3. Constructing a Testable Hypothesis
(An educated, testable prediction: If... then...)
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4. Controlled Experimentation
(Testing only ONE variable while keeping others constant)
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5. Data Collection & Empirical Analysis
(Recording quantitative & qualitative data)
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6. Conclusion & Global Peer Review
(Confirming, refining, or rejecting the hypothesis)
2. Variables in a Scientific Experiment
To ensure an experiment is fair and valid, scientists strictly control variables:
- Independent Variable: The factor intentionally changed or manipulated by the experimenter (e.g., amount of fertilizer given to plants).
- Dependent Variable: The factor measured to observe the effect of the change (e.g., plant height in centimeters).
- Controlled (Constant) Variables: All conditions kept strictly identical across all experimental groups (e.g., amount of water, sunlight, soil type, and pot size).
3. Difference Between Observation and Inference
- Observation: Direct information gathered using our five senses or calibrated instruments (e.g., "The liquid turned red and bubble formation was observed").
- Inference: A logical interpretation or deduction based on prior knowledge and observations (e.g., "A chemical gas was evolved during the reaction").