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The numerical tool takes into account the random distributions of powder particles by size in a layer and the propagation of the laser ( electron beam ) with a full ray tracing ( Monte Carlo ) model that includes multiple reflections , phase transitions , thermal conductivity , and detailed liquid dynamics of the molten metal , influenced by evaporation of the metal and the recoil pressure .
 tool, distributions, powder particles, layer, laser, electron beam, model, phase, thermal conductivity, molten metal, evaporation, metal, pressure
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 tool, distributions, powder particles, layer, laser, electron beam, model, phase, thermal conductivity, molten metal, evaporation, metal, pressure