Scientific Method/Process Law Principle Theory Empirical model Physical (mechanistic) Model SI measurement units Unit conversion factor Order of magnitude estimation Scientific notation Metric prefix ...Scientific Method/Process Law Principle Theory Empirical model Physical (mechanistic) Model SI measurement units Unit conversion factor Order of magnitude estimation Scientific notation Metric prefix Identify the differences and relationships between empirical models, physical models, hypotheses, theories, and laws. Find necessary conversion factors and convert between SI and non-standard units for several physical quantities.