Molecular Modeling

A model is a semblance or a representation of reality. Early chemical models were often mechanical, allowing scientists to visualize structural features of molecules and to deduce the stereochemical outcomes of reactions. The disadvantage of these simple models is that they only partly represent (model) most molecules. More sophisticated physics-based models are needed; these other models are almost exclusively computer models. 

Read more: Molecular Modeling - Chemistry Encyclopedia - structure, uses, gas, number, equation, property, molecule, atom http://www.chemistryexplained.com/Ma-Na/Molecular-Modeling.html#ixzz29Wel9asS