Final answer:
Electricity is the common factor among all the given actions, as it can be generated and utilized in various ways.
Step-by-step explanation:
The word that connects all the given actions (boiling, volumetric, condensing, rubbing, burning, electricity) is electricity. Electricity can be generated and utilized in various ways, such as boiling water to create steam, which can then turn a turbine and generate electricity. Similarly, rubbing objects can create static electricity, and burning fuel can produce electricity through power plants.