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In the process , liquid metal is confined and semi-levitated by the Lorentz force exerted by magnetic field and thus the flow of liquid metal is restricted .
 concept or principle: process; material: liquid metal; concept or principle: Lorentz force; concept or principle: magnetic field; material: liquid metal
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: process; material: liquid metal; concept or principle: Lorentz force; concept or principle: magnetic field; material: liquid metal