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Using this framework , the fluid dynamics of the melt pool flow in the laser melting process is found to be mainly driven by the competing Marangoni force and the recoil pressure on the liquid metal surface .
 concept or principle: framework; material: fluid; material: melt pool; enabling technology: laser; concept or principle: process; material: be; concept or principle: force; concept or principle: pressure; material: liquid metal
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: framework, fluid, melt pool, laser, process, be, force, pressure, liquid metal 
Answer:
 concept or principle: framework; material: fluid; material: melt pool; enabling technology: laser; concept or principle: process; material: be; concept or principle: force; concept or principle: pressure; material: liquid metal