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The latter , i.e. , the molten pool model , captures the interaction between laser beam and individual powder particles including free surface evolution , surface tension and evaporation .
 concept or principle: molten pool; concept or principle: model; concept or principle: laser beam; material: powder particles; concept or principle: free surface; concept or principle: evolution; machanical property: surface tension; concept or principle: evaporation
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: molten pool, model, laser beam, powder particles, free surface, evolution, surface tension, evaporation 
Answer:
 concept or principle: molten pool; concept or principle: model; concept or principle: laser beam; material: powder particles; concept or principle: free surface; concept or principle: evolution; machanical property: surface tension; concept or principle: evaporation