Molecular formula :
nature : to examine the system, process, thing or concept of a form of expression. Models can be physical entities and there can be some kind of graphic or a mathematical expression. With this approach can greatly reduce the workload experiment, but also help to understand the process of substance. Some chemical reaction process if the process is chemical reaction with the transfer process (physical process) interactive process, chemical reactions and physical processes are often impossible to meet similar chemical and physical conditions similar. So the traditional dimensional theory similar method is no longer applicable, then model can be used for research.
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