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Both the surface tension and surface tension driven flow were found smaller in the central area .
 machanical property: surface tension; machanical property: surface tension; process parameter: area
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: surface tension, surface tension, area 
Answer:
 machanical property: surface tension; machanical property: surface tension; process parameter: area