Standards for Measurement - Columbia University

Standards for Measurement

Preparation for College Chemistry Columbia University Department of Chemistry

The Scientific Method

Observations

(analysis) Hypothesis

Laws (explanation)

Experiment (measurement) (analysis)

Theory (Model)

Measurement and Interpretations

Direct Measurement Diameter = 2.5 cm

1

23

4 5 67 8

Interpretation Step

Radius = Diameter/2 Area = p x r2 = 8.04 cm2

Art of Scientific Measurement:

? Recognize what can be measured directly. ? Devise a way to obtain the desired information from measurement data.

Experimentation

Measured Data

Resting Potential = -65 mV

UNIT

Basic Derived

Affected by Uncertainty ? Accuracy

NUMERICAL VALUE

? Precision ? Resolution

? Noise

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