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Answer:
Must be in contact with the liquid
The temperature also has to be altered.
Step-by-step explanation:
Convection cannot happen in a vacuum
Convection results from a change in density in the fluid
Answer: Convection requires a medium for heat to travel. Mainly, convection is the transfer of heat energy through fluids which are liquids and gases. Due to heat transfer or absorption the density of fluids changes and causes them to rise since they become less dense. So cooler particles sinks due to the fact that it is more dense.