3497
The microfluidic systems are then filled with room temperature liquid metal , a gallium alloy liquid at room temperature , and ferrofluid to create inductors , transformers and wireless power coils .
 temperature, liquid metal, gallium, alloy, temperature, power
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:
 temperature, liquid metal, gallium, alloy, temperature, power